Continuing Education Activity

Ocular burns constitute a true ophthalmic emergency and are a major cause of preventable visual impairment worldwide. Injury most commonly results from chemical exposure, particularly alkali agents, but may also follow acid, thermal, or radiation exposure. Risk factors include occupational hazards, industrial accidents, household chemical access, and inadequate eye protection. Tissue damage is mediated by direct cytotoxicity, inflammation, ischemia, and disruption of limbal stem cell function, with alkali injuries producing rapid and deep ocular penetration. Clinical presentation ranges from conjunctival hyperemia and epithelial defects to corneal opacification, elevated intraocular pressure, and extensive limbal ischemia.

Diagnosis is clinical and relies on prompt assessment of ocular surface integrity, limbal involvement, and anterior segment damage. Management prioritizes immediate and copious irrigation, followed by targeted medical and surgical interventions based on injury severity. Complications include corneal scarring, limbal stem cell deficiency, glaucoma, chronic inflammation, and dry eye disease. Visual prognosis depends on injury mechanism, extent of limbal involvement, and timeliness of intervention.

This activity for healthcare professionals is designed to enhance learners' competence in evaluating and managing ocular burns. Participants will advance their mastery of the condition's etiology, risk factors, pathophysiology, clinical presentation, and evidence-based diagnostic and therapeutic approaches. Improved skills will equip clinicians to collaborate with interprofessional teams providing care for affected individuals.

Objectives:

• Implement a structured assessment of ocular burns, prioritizing urgent irrigation and systematic grading of corneal and limbal involvement to guide subsequent therapeutic interventions.
• Apply evidence-based, personalized strategies for managing ocular burns and mitigating potential sequelae.
• Improve patient understanding of potential complications, long-term management needs, proper home and occupational eye protection strategies, and the role of specialist care in preserving vision after ocular burns.
• Collaborate with all members of the interprofessional team, including specialists such as emergency medicine physicians, ophthalmologists, and rehabilitation specialists, to provide efficient, comprehensive, and coordinated care for individuals who have sustained ocular burns.

Introduction

Acute ocular burns constitute true ophthalmic emergencies. Injury severity depends on multiple factors, including the offending agent, duration of exposure, affected surface area, and specific ocular tissues involved. Moderate-to-severe burns of the eye and adnexa cause significant morbidity and may result in long-term impairment of vision and quality of life. Acute and chronic pain, scarring with disfigurement, loss of normal protective adnexal function, and permanent vision loss represent common sequelae of severe burns.[1] Permanent vision loss correlates with increased risk of serious biopsychosocial complications, including subsequent injuries, depression, and chronic disease.[2][3][4][5]

Ocular burns represent one of the most devastating ophthalmic emergencies, accounting for a substantial proportion of preventable visual morbidity worldwide. Exposure of the ocular surface and adnexa to chemical, thermal, electrical, or radiation-related agents can produce profound short- and long-term consequences, including corneal scarring, limbal stem cell deficiency (LSCD), glaucoma, cataract, symblepharon formation, and irreversible blindness. Despite advances in emergency care and reconstructive ophthalmology, ocular burns continue to present significant diagnostic, therapeutic, and rehabilitative challenges, particularly in low- and middle-income countries where occupational safety standards and timely access to specialized eye care are limited.[6]

Chemical burns constitute the most common and vision-threatening category of ocular burns. These injuries occur in industrial, domestic, and agricultural settings, as well as during assaults. Alkali burns are particularly severe due to the lipophilic nature of these substances, which permits rapid penetration through the corneal epithelium and stroma into deeper ocular structures. Acid burns typically produce coagulative necrosis, which may limit deeper penetration but can still result in extensive surface injury. Thermal burns, often confined to the eyelids and conjunctiva, can cause significant ocular surface damage depending on temperature, exposure duration, and associated chemical contaminants. Although less frequent, electrical and radiation-induced burns may lead to complex anterior and posterior segment pathology with delayed manifestations.[7]

Ocular burn pathophysiology involves a cascade of acute and chronic inflammatory responses. Immediate tissue injury is followed by progressive cellular necrosis, ischemia, and release of inflammatory mediators, perpetuating damage beyond the initial insult. Limbal ischemia critically influences prognosis, as destruction of limbal stem cells disrupts corneal epithelial regeneration, producing persistent epithelial defects, conjunctivalization, neovascularization, and stromal scarring. Damage to conjunctival goblet cells and accessory lacrimal glands further contributes to severe ocular surface dryness, exacerbating epithelial instability and inflammation.[8]

Clinical presentation of ocular burns varies according to the nature and severity of the injury. Mild burns may produce pain, photophobia, blurred vision, redness, and excessive tearing, whereas severe injuries can manifest with corneal opacification, limbal blanching, anterior chamber inflammation, and profound visual loss. Apparent severity at initial presentation may underestimate eventual tissue damage, particularly in alkali burns, in which ongoing penetration and inflammation continue after exposure ends. Meticulous assessment, early grading, and close follow-up are essential in all cases of ocular burns.[9]

Several classification systems have been developed to stratify ocular burns and guide management and prognosis. Traditional grading emphasizes corneal involvement and limbal ischemia, while contemporary systems incorporate conjunctival injury and more accurately predict long-term outcomes. These classifications enable standardized communication, prognostication, and comparison of outcomes across studies. Individual patient outcomes may still vary within similar grades, influenced by timing of irrigation, adequacy of acute management, patient age, and access to advanced reconstructive interventions.[10]

Immediate and aggressive management is the cornerstone of ocular burn treatment. Prompt, copious irrigation to normalize ocular surface pH constitutes the most critical initial intervention, often influencing final visual outcome more than the chemical agent itself. Subsequent therapy follows a staged approach aimed at suppressing inflammation, promoting epithelial healing, preventing infection, and minimizing cicatricial sequelae.

Medical management consists of intensive ocular lubrication, administration of topical corticosteroids and cycloplegics, control of intraocular pressure (IOP) with antiglaucoma agents, and use of adjunctive compounds, such as ascorbate and citrate, to maintain stromal integrity. Severe injuries may require surgical intervention, ranging from amniotic membrane transplantation (AMT) during the acute phase to limbal stem cell transplantation (LSCT), keratoplasty, and complex ocular surface reconstruction in the chronic phase.[11]

Long-term sequelae are common despite optimal management and frequently necessitate interprofessional care. Chronic ocular surface inflammation, eyelid malpositions, symblepharon, secondary glaucoma, and cataract can significantly impair visual rehabilitation and quality of life. Substantial psychosocial impact, particularly among younger and working-age patients, underscores the importance of prevention, adherence to workplace safety regulations, and public education alongside clinical management.[12]

Recent advances in ocular surface biology, regenerative medicine, and surgical techniques have transformed the management paradigm for severe ocular burns. Improved understanding of limbal stem cell dynamics, the introduction of cultivated epithelial transplantation, and refinements in amniotic membrane application have enhanced both anatomical and functional outcomes. Persistent disparities in access to these advanced therapies highlight the need for context-appropriate treatment algorithms and capacity building in resource-limited settings.[13]

This activity provides a comprehensive overview of ocular burns, encompassing epidemiology, mechanisms of injury, pathophysiology, clinical evaluation, classification, and management strategies across acute, intermediate, and chronic phases. Integration of current evidence with practical clinical guidance equips ophthalmologists and eye care professionals with a structured approach to this complex condition. Emphasis is placed on early intervention, individualized management, and long-term rehabilitation, acknowledging that timely and appropriate care can significantly influence visual and functional prognosis in patients with ocular burns.

Etiology

Burns of the eye and ocular adnexa may be categorized as thermal or chemical. Important distinctions exist in the immediate progression of these injuries. Tissue damage from thermal burns typically abates once heat is no longer in contact with the ocular surface or the source loses thermal energy. Examples include removal from a house fire or a flash burn from an explosion or fireworks. The protective nature of the ocular adnexa and the blink reflex often concentrates damage on the eyelid skin. Direct thermal injury to the ocular surface is usually superficial due to brief contact. Common causes include hot water, hot cooking oil, curling irons, and flames, as observed in fires and explosions. Thermal burns generally require expectant management similar to other superficial corneal injuries.[14]

Chemical burns require more aggressive initial intervention. Tissue injury may persist and extend into deeper ocular structures as long as the chemical remains in contact with the eye and adnexa. Prompt removal of the chemical is essential to prevent ongoing ocular surface and intraocular damage. Chemical burns may result from household products such as drain or oven cleaners, laundry or dish detergents, bleach, and ammonia, as well as industrial exposures including fertilizers, industrial acids, lye, lime, and cement. Fireworks and explosions can cause combined thermal and chemical injuries.[15] Blast injuries should raise suspicion for full-thickness and penetrating injuries with possible intraocular foreign bodies.

Etiological Classification of Ocular Burns

Ocular burns result from exposure to chemical, thermal, electrical, or radiation-related agents. Etiology dictates tissue penetration depth, inflammation severity, extent of limbal damage, and ultimate visual prognosis. Among all causes, chemical burns, particularly alkali injuries, pose the greatest threat to vision due to rapid penetration and sustained intraocular injury.[16]

Chemical burns encompass alkali, strong acids, weak acids, organic solvents, and irritants. Alkali agents, such as lime, ammonia, cement, lye, sodium hydroxide, and potassium hydroxide, typically occur in industrial accidents, construction-related trauma, or assaults and produce the most severe injuries due to saponification of cell membranes and deep stromal penetration, often resulting in limbal ischemia.

Strong acids, including sulfuric, hydrochloric, nitric, and battery acids, are usually associated with industrial exposures or battery explosions and cause coagulative necrosis that limits deeper penetration but may still produce moderate-to-severe ocular surface injury. Weak acids, such as acetic acid, generally produce superficial damage with limited penetration. Organic solvents, including alcohol and acetone, induce epithelial toxicity, whereas irritants such as detergents and pepper spray trigger neurogenic inflammation and are more commonly encountered in domestic or law enforcement settings.

Thermal burns result from exposure to fire, steam, hot liquids, molten metal, or fireworks, typically in household, occupational, or festive settings. These injuries often remain superficial, with the eyelids absorbing most damage due to protective adnexal structures. Electrical burns, caused by high-voltage current or lightning, produce deep tissue injury with delayed manifestations. Radiation burns from UV light, such as welding arcs, or ionizing radiation, as in radiotherapy, can induce delayed epithelial and stromal injury.

Ocular burns follow a predictable etiological pathway. Exposure to chemical, thermal, electrical, or radiation agents produces immediate epithelial injury, which triggers the release of inflammatory mediators. Subsequent limbal ischemia and potential stem cell loss contribute to corneal opacity, neovascularization, and cicatrization. Chemical burns demonstrate mechanism-specific patterns. Alkali agents penetrate rapidly into the stroma, often causing limbal ischemia and severe LSCD, resulting in a poor prognosis without prompt intervention. Acid injuries induce surface coagulation that limits depth, with variable limbal involvement and relatively better healing potential.

Prognosis varies by etiology. Alkali burns typically produce extensive limbal damage, poor healing potential, and guarded visual outcomes. Acid burns show variable limbal injury, moderate healing, and a fair visual prognosis. Thermal burns generally cause minimal limbal involvement, good healing potential, and favorable visual outcomes. Radiation burns produce delayed epithelial and stromal injury, with variable healing and visual results. Electrical burns result in deep tissue damage, reduced regenerative capacity, and a guarded visual prognosis.

Occupational and environmental exposures significantly influence the risk of ocular burns. Industrial settings, such as cement factories and chemical plants, and agricultural environments involving pesticides or fertilizers, pose frequent hazards. Domestic accidents, including cleaning agents and kitchen burns, and festive injuries from fireworks or sparklers, also contribute to risk. Assault-related injuries, particularly acid attacks, remain a serious concern. Lack of adequate eye protection or personal protective equipment (PPE) further increases the likelihood of severe ocular injury.

Understanding the etiology of ocular burns is essential for guiding immediate triage and irrigation, predicting outcomes based on agent type, selecting early surgical interventions such as AMT or limbal support, and planning long-term rehabilitation. Chemical composition, concentration, exposure duration, and time to irrigation are key determinants of outcome, often exerting greater influence than initial clinical appearance.[17]

Epidemiology

The worldwide incidence of ocular burns is largely unknown, reflecting a persistent knowledge gap despite available data. The World Health Organization’s Blindness Data Bank reports penetrating eye injuries and damage leading to blindness but does not include data on ocular chemical burns.[18] Two US databases—the IRIS® (Intelligent Research in Sight) Registry of the American Academy of Ophthalmology (AAO) and the Nationwide Emergency Department Sample, part of the Healthcare Cost and Utilization Project—provide insight into the scope of this critical public health problem in the US.[19]

Ocular chemical burns account for 11.5% to 22.1% of eye injuries.[20] In 1999, approximately 280,000 work-related eye injuries were treated in US emergency departments, with chemical burns ranking 2nd only to ocular foreign bodies. Workers aged 20 to 34 years faced the highest risk.[21] From 2010 to 2013, 144,419 cases of chemical ocular burns were treated in US emergency departments, with a median patient age of 32 years. Injury rates were highest among children aged 1 to 2 years (28.61 and 23.49 per 100,000 population, respectively). These figures are largely extrapolated from case series and are limited by missing data, highlighting the need for robust epidemiologic studies.[22]

Alkali-induced ocular burns (53.6%) occur more commonly than acid injuries (46.4%), with some sources suggesting a nearly 2:1 ratio. Ammonia-containing compounds are the most frequent cause of alkali burns, whereas sulfuric acid predominates among acid trauma.

Ocular burns constitute a substantial proportion of ocular trauma and are a major cause of preventable visual impairment worldwide. Reported incidence varies across geographic regions, levels of industrialization, occupational safety measures, and access to prompt ophthalmic care. Globally, ocular burns account for approximately 7% to 18% of all ocular injuries and contribute to 1% to 2% of cases of unilateral blindness, with disproportionately higher morbidity in low- and middle-income countries. 

In the US, the estimated incidence ranges from 15 to 20 cases per 100,000 population per year. Most injuries occur in occupational settings, particularly in industries involving chemicals, construction, manufacturing, and laboratories. Improved workplace regulations and early emergency care have resulted in better visual outcomes compared with developing regions.

The global burden is substantially higher in Asia, Africa, and parts of Latin America, where industrial exposure, agricultural chemical use, and limited access to PPE are common. Delayed presentation and restricted access to tertiary eye care contribute to worse outcomes in these regions. 

Epidemiologic patterns demonstrate a marked male predominance, reflecting occupational exposure. Domestic and assault-related injuries, particularly acid attacks, disproportionately affect women and children in certain regions. Age distribution is bimodal, with the highest incidence among the working-age population (21–50 years) and a secondary peak in children, largely due to accidental household exposure.[23]

Epidemiologic patterns of ocular burns demonstrate strong associations with sex, age, and environmental exposure. Male patients account for 70% to 85% of cases, largely due to occupational and industrial hazards, whereas female patients represent 15% to 30%, often reflecting domestic or assault-related injuries. Children younger than 10 years comprise 10% to 20% of cases, primarily from accidental household chemical exposure. Young adults aged 21 to 50 account for 45% to 60% of cases, mainly workplace-related, and older adults older than 50 represent 10% to 20%, often linked to domestic accidents and reduced protective reflexes.

Regional distribution and outcomes vary by geography. In the US, incidence is moderate, with occupational and domestic exposures predominating, and visual outcomes are generally favorable. Europe shows a similar moderate incidence, with industrial and household exposures and favorable outcomes. Asia and Africa demonstrate a higher incidence, often linked to industrial, agricultural, and assault-related exposures, with variable or poorer visual outcomes. Worldwide, approximately 1.5 to 2 million cases occur annually, with chemical burns more common than thermal injuries. Visual outcomes are region-dependent. 

The epidemiology of ocular burns underscores their preventable nature, with clear associations to occupation, age, sex, and socioeconomic factors. Early identification of at-risk populations enables targeted prevention, public health interventions, and optimized visual outcomes.[24]

Pathophysiology

Acute tissue damage from ocular burns is determined by multiple factors, including the chemical and physical properties of the offending agent (primarily pH), concentration, volume, temperature, impact force, and the agent’s interaction with ocular tissue (see Image. Pathophysiology of Ocular Burns). Alkali burns, such as those from lime or ammonia, penetrate rapidly through the corneal epithelium via saponification of cell membrane lipids, producing deep stromal, limbal, and intraocular involvement. These substances are lipophilic and penetrate more deeply than acidic agents, causing liquefactive necrosis. As superficial tissues liquefy, the chemical may extend into intraocular structures, including the trabecular meshwork, lens, and ciliary body.

Acid burns induce protein coagulation and precipitation, forming a barrier that generally limits deeper penetration and results in more superficial injury. Hydrofluoric acid is a notable exception, capable of damaging anterior chamber structures. Despite differing mechanisms of tissue interaction, both acids and alkalis can produce severe ocular injury. 

Thermal burns primarily affect the eyelids and ocular surface through coagulative necrosis, mitigated in part by the blink reflex. Radiation and electrical injuries cause delayed cellular damage via free radical formation and microvascular ischemia.

Ocular burns induce tissue damage through ischemia, inflammation, and stem cell loss. Ischemia from vascular thrombosis and hypoxia affects the limbus and sclera, resulting in poor healing and tissue necrosis. Inflammatory responses, including cytokine and protease release, involve the cornea and conjunctiva, potentially causing corneal melting and perforation.

LSCD remains a central pathophysiologic feature, disrupting corneal epithelial regeneration and contributing to persistent epithelial defects, conjunctivalization, corneal neovascularization, and scarring. Concurrent ischemia, inflammatory mediator release, collagenase activation, and oxidative stress further amplify tissue destruction, which may continue after removal of the offending agent.[25]

The pathophysiology and disease course of chemical ocular burns are often described in 4 clinical phases: immediate, acute (0–7 days), early reparative (7–21 days), and late reparative (after 21 days).[26] For practical management, some authors categorize chemical ocular injuries into immediate, acute (<6 weeks), and chronic (>6 weeks) phases.

Once the immediate insult has been addressed, a therapeutic plan should be implemented to reduce inflammation and promote reepithelialization. Limbal and conjunctival ischemia, persistent inflammation, ocular surface exposure from adnexal scarring, and elevated IOP can impede epithelial healing if not properly managed. Specific therapeutic and surgical strategies targeting the underlying burn pathophysiology are detailed in the Treatment and Management section.

Ocular burns arise from tissue injury caused by chemical, thermal, electrical, or radiation agents. The severity of damage depends on the agent’s properties, duration of contact, concentration, and depth of penetration. Chemical burns, particularly alkali injuries, produce the most severe and progressive ocular damage due to rapid tissue penetration and sustained inflammatory responses.[27]

Histopathology

Histopathologic Progression of Ocular Burns

Ocular burns produce a spectrum of histopathological changes determined by the nature of the agent (chemical versus thermal), severity, duration of exposure, and promptness of irrigation and treatment (see Image. Microscopic Pathogenesis of Ocular Burns). Microscopic alterations affect the cornea, limbus, conjunctiva, sclera, and intraocular tissues, evolving dynamically from acute necrosis to chronic scarring and remodeling.

Acute phase

The acute phase occurs within minutes to several days after injury and is defined by immediate tissue necrosis and epithelial disruption. Epithelial injury predominates in this stage. Chemical burns, particularly alkali injuries, penetrate rapidly through the corneal epithelium into the stroma via saponification of cell membrane lipids. Histologic findings include epithelial sloughing, stromal edema, collagen disorganization, and keratocyte necrosis. Neutrophilic infiltration is prominent, with early endothelial dysfunction contributing to corneal edema.

Subacute phase

The subacute phase spans from days to several weeks postinjury and is characterized by progressive inflammation and early reparative changes. Persistent epithelial defects, stromal ulceration, and LSCD become evident. Loss of limbal palisades of Vogt and depletion of stem cell niches are key microscopic features. Inflammatory mediators drive matrix metalloproteinase (MMP) activity, resulting in stromal melt. Conjunctival goblet cell loss and fibroblast activation are frequently observed.[28]

Chronic phase

The chronic phase begins after several weeks and may extend for months, representing late reparative and remodeling processes. Histopathology is characterized by fibrosis, neovascularization, conjunctivalization of the cornea, and scarring. The corneal stroma demonstrates dense collagen deposition with reduced keratocyte density. LSCD allows conjunctival epithelium to invade the cornea, often accompanied by abnormal vascular channels and chronic inflammatory infiltrates.[29]

Histopathological Changes in Ocular Burns by Tissue Layer

Ocular burns induce layer-specific histopathological changes that evolve over time. In the corneal epithelium, acute injury produces epithelial sloughing and cellular necrosis, progressing to persistent epithelial defects and conjunctivalization in the chronic phase. The corneal stroma exhibits edema, collagen disarray, and keratocyte loss acutely, followed by fibrosis, stromal thinning, and scarring. Endothelial injury manifests as acute cell damage and edema, with permanent endothelial cell loss occurring chronically. Limbal tissue demonstrates stem cell necrosis and ischemia acutely, leading to LSCD. Conjunctival changes include acute goblet cell loss and inflammation, evolving into subepithelial fibrosis and symblepharon formation. Scleral involvement is minimal initially but may progress to thinning and necrosis in severe burns.

Histopathologic Differences Between Alkali and Acid Burns

Alkali burns penetrate rapidly and deeply, causing severe stromal collagen dissolution, marked neutrophilic infiltration, and frequent, extensive limbal injury, resulting in extensive long-term scarring. Acid burns produce primarily superficial coagulative necrosis, with limited stromal involvement, moderate inflammation, less frequent limbal injury, and variable long-term scarring.

The microscopic hallmark of severe ocular burns is LSCD accompanied by progressive stromal remodeling. This pathology directly correlates with impaired epithelial healing and persistent inflammation.

Toxicokinetics

Toxicokinetics in ocular burns describes the entry, distribution, tissue interactions, and persistence of chemical agents within ocular structures, ultimately determining injury severity, depth, and progression. Unlike systemic toxicokinetics, ocular kinetics is governed primarily by local tissue penetration, chemical reactivity, and clearance mechanisms rather than metabolism or excretion.

Chemical agents enter the eye through direct contact with the ocular surface, involving the tear film, corneal epithelium, and conjunctiva. The tear film initially dilutes the agent but also facilitates rapid spread across the ocular surface. Protective mechanisms, including the blink reflex and reflex tearing, may partially limit exposure. However, high-volume or high-concentration chemicals can overwhelm these defenses.[30]

Alkali agents, such as ammonia, sodium hydroxide, and lime, are lipophilic and rapidly penetrate the corneal epithelium and stroma by saponifying cell membrane lipids, allowing deep diffusion into the anterior chamber. Acidic agents, including sulfuric and hydrochloric acids, induce protein coagulation, forming a barrier that partially limits deeper penetration. Organic solvents penetrate both lipid and aqueous layers, facilitating widespread tissue involvement. Once inside the eye, chemicals distribute sequentially through the cornea, anterior chamber, iris, lens, and ciliary body, with severe alkali exposure occasionally reaching the vitreous and retina.[31]

Chemical reactivity and tissue binding further influence injury. Alkalis bind to collagen and proteoglycans, resulting in prolonged tissue retention, while heavy metals may deposit within ocular structures, causing chronic toxicity. Persistent tissue-bound chemicals can continue to inflict damage despite early surface irrigation, explaining why ocular injury may progress even after initial decontamination.[32]

Chemical agents disrupt cell membranes, impair mitochondrial function, denature proteins, inactivate enzymes, and trigger the release of inflammatory mediators. These primary effects initiate secondary cascades, including ischemia, oxidative stress, and immune-mediated injury, extending tissue damage beyond the initial exposure.[33]

Ocular clearance depends on tear turnover, aqueous humor dynamics, chemical solubility and reactivity, and the degree of tissue binding. Highly reactive alkalis are cleared slowly, whereas weak acids and water-soluble agents are eliminated more rapidly. Severe burns with impaired aqueous outflow further delay clearance, prolonging chemical toxicity.

Strong alkalis penetrate ocular tissues very rapidly, exhibit high tissue binding, produce deep injury involving the anterior chamber and iris, and are cleared slowly. Acids penetrate moderately, bind to tissues at a moderate level, cause superficial to stromal injury, and are cleared more rapidly. Organic solvents penetrate rapidly, demonstrate variable tissue binding, produce diffuse injury, and have variable clearance. Heavy metals penetrate slowly to moderately, bind tightly to tissues, cause localized but persistent damage, and are cleared very slowly.

The severity of ocular burns correlates more closely with toxicokinetics than exposure duration alone. Early and prolonged irrigation reduces tissue concentration and limits penetration. Alkali burns demand aggressive and repeated intervention due to deep penetration and prolonged tissue retention.

Ocular toxicokinetics explains why some chemical burns progress rapidly, injury may worsen after initial treatment, and alkali burns carry the poorest prognosis. Understanding these principles is essential for guiding early management, prognostication, and long-term follow-up in patients sustaining ocular burns.[34]

History and Physical

A structured history focusing on agent type, exposure duration, and initial intervention, combined with a meticulous ocular examination emphasizing corneal, limbal, and anterior chamber findings, forms the cornerstone of early ocular burn assessment (see Image. Clinical Evaluation Pathway in Ocular Burns). Findings from the history and examination guide classification, prognostication, and immediate therapeutic decision-making.

Initial evaluation in both prehospital and hospital settings must address life-threatening conditions while minimizing risk to care providers. Particular attention should be given to airway, breathing, and circulation (ABCs). Further ocular examination can proceed once the ABCs have been evaluated, and no urgent intervention is required. 

For patients with normal mental status, ongoing evaluation should focus on the chemical exposure. During continued decontamination, the care team should document the offending chemical agents and the extent of exposure. Additional patient-specific details, including medical history, medications, allergies, surgical history, and time of last meal, may be collected concurrently with ocular irrigation.

After stabilization and initiation of irrigation, further investigation into the properties of the chemical agents can occur. Safety data sheets and Poison Control Center resources provide essential guidance for acute management of hazardous chemical exposures.[35]

Assessment of the extent of involvement can begin once the eyes and associated structures have been adequately irrigated, and the ocular surface pH reaches neutral (7.0–7.4), as determined by a litmus paper test. Visual acuity should be evaluated if feasible. Pain from superficial exposure of the ocular nerves may cause significant blepharospasm, limiting the examination. Application of a topical ocular anesthetic may be necessary prior to biomicroscopy (slit lamp evaluation).

Particular attention should be directed toward limbal and conjunctival (episcleral) ischemia, corneal clarity, and the total surface area involved. Surface area assessment requires staining with an agent such as sodium fluorescein. The extent and severity of tissue involvement provide prognostic information.

Evidence of ocular perforation should be sought during biomicroscopy. IOP may be safely measured if no concern for a ruptured globe exists.

History

A focused, comprehensive history should be obtained immediately, emphasizing factors that influence injury severity, toxicokinetics, and urgency of intervention. Patients commonly present with sudden ocular exposure to chemical, thermal, electrical, or radiation sources. Chemical injuries, the most frequent, require characterization by agent type (alkali, acid, organic solvent, or unknown), physical form (liquid, powder, gas, or aerosol), concentration and volume, and duration of contact before irrigation. Alkali injuries are particularly concerning due to rapid tissue penetration and progressive damage.

The time elapsed since exposure is critical, as delayed presentation correlates with more extensive tissue involvement and poorer outcomes. History should document the time of injury, whether immediate irrigation was performed, and the type and duration of any irrigation applied.

Common presenting symptoms of ocular burns include severe pain or burning, sudden vision loss or decrease, redness, excessive tearing, photophobia, and foreign body sensation or blepharospasm. Pain may be minimal in severe alkali burns due to corneal nerve damage.[36]

History should explore occupational and environmental exposures, including contact with chemicals in construction, agricultural, or manufacturing settings; domestic accidents involving cleaning agents such as lime or detergents; and assault-related or accidental splashes. Use of PPE should also be documented. Relevant ocular and medical history includes prior ocular surface disease or surgery, contact lens use, preexisting glaucoma or dry eye disease (DED), and systemic illnesses such as diabetes, autoimmune disorders, or connective tissue disease.[37]

Physical Examination

A systematic, stepwise examination should be performed after copious irrigation, with repeated assessments during follow-up. General inspection should identify facial burns or chemical residue on periocular skin, eyelid edema, erythema, blistering, necrosis, and involuntary lid closure or blepharospasm. Visual acuity should be documented before and after irrigation when feasible. Reduced acuity may result from corneal epithelial defects, stromal edema, or anterior chamber inflammation. 

Examination of the eyelids and conjunctiva should note chemosis, conjunctival hyperemia, and blanching, which indicates limbal ischemia. Fornices should be everted to detect retained particulate matter. Slit lamp evaluation of the cornea may reveal epithelial defects or sloughing, stromal haze or edema, loss of clarity, and positive fluorescein staining. Corneal sensation may be reduced or absent in severe injuries.[38]

Assessment of the limbus is critical, as the extent of ischemia represents the single most important prognostic indicator. Findings may include segmental or circumferential blanching, loss of the palisades of Vogt, and poor epithelial regeneration. Anterior chamber evaluation should document cells and flare, hypopyon in severe inflammation, and pupillary abnormalities or synechiae.[39]

IOP may be elevated due to trabecular meshwork damage or low from ciliary body shutdown, with both extremes carrying prognostic significance. Posterior segment assessment is often limited by corneal opacity. B-scan ultrasonography should be used to evaluate vitreous status, retinal detachment, and choroidal thickening when visualization is poor.[40]

Key Clinical Pearls

Certain important considerations demand attention in the evaluation and management of ocular burns. Pain severity does not reliably indicate the depth of injury. Limbal ischemia strongly predicts long-term visual outcome. Serial examinations are crucial, as pathology may evolve over time.

Evaluation

Initial clinical evaluation should follow guidelines from the AAO and the Royal College of Ophthalmologists, beginning with confirmation of neutral ocular surface pH, followed by assessment of injury severity, identification of LSCD, and detection of associated adnexal or intraocular damage (see Image. Recommended Protocol for the Evaluation of Ocular Burns).

Visual acuity should be recorded using the Snellen or logMAR (logarithm of the minimum angle of resolution) scale when feasible. Light perception and projection of rays should be documented in severe burns. Baseline vision serves as a strong prognostic indicator and should be obtained before edema progression.

Slit lamp biomicroscopy remains central to evaluation (see Image. Digital Slit Lamp Examination of Ocular Thermal Burn). Corneal assessment includes epithelial defects and sloughing, stromal edema and haze, and ischemic whitening. Limbal ischemia is noted by blanching and clock-hour involvement. Conjunctival evaluation identifies chemosis and epithelial loss. Anterior chamber examination detects cells, flare, or hyphema, while iris and pupil assessment evaluates atrophy, synechiae, and pupillary reaction. Fluorescein staining is essential to delineate epithelial and conjunctival involvement.

IOP should be measured once the globe is stable. Elevation may result from trabecular damage or intraocular inflammation, while abnormally low values may indicate ciliary body shutdown or occult perforation. Repeated measurements during follow-up are recommended.[41]

Posterior segment evaluation is performed with indirect ophthalmoscopy when media clarity allows. The AAO Preferred Practice Pattern (PPP) recommends that B-scan ultrasonography should be used to assess vitreous hemorrhage, retinal detachment, or choroidal effusion if visualization is limited.[42]

Advanced imaging is generally not required for ocular burns. Computed tomography (CT) of the orbits may be indicated if an intraocular foreign body is suspected, particularly in blast injuries. Further imaging should be guided by history, physical examination, and clinical suspicion of additional injuries. Anterior segment optical coherence tomography (AS-OCT) provides assessment of corneal thickness, epithelial healing, and limbal architecture. Ultrasound biomicroscopy is valuable in severe burns with anterior chamber angle involvement. CT of the orbits is indicated when an intraocular foreign body or orbital fracture is suspected, particularly in thermal or explosive injuries.[43]

Laboratory investigations are not routinely required but may be indicated in industrial chemical burns with potential systemic toxicity, alkali exposure from unknown agents, or polytrauma cases. Relevant tests include a complete blood count, renal function panels, and toxicology screening as clinically appropriate.

Follow-up evaluation should occur daily during the acute phase (first 7–10 days), with emphasis on epithelial healing, limbal perfusion, IOP trends, and early detection of infection or corneal melt. Long-term monitoring addresses LSCD, corneal neovascularization, glaucoma, DED, and symblepharon formation.[44]

Prognosis in ocular burns depends not solely on the type of agent, but also on the extent of limbal ischemia and the depth of tissue involvement. Careful evaluation of these factors at presentation is essential for accurate prognostication.

Treatment / Management

Management of chemical ocular burns begins with immediate and copious decontamination of the ocular surface and adnexa. Concurrent decontamination of the remainder of the body should be performed when indicated, with careful attention to the oropharynx to reduce the risk of inhalational injury. Removal and disposal of contaminated clothing may be required, and strict precautions are necessary to prevent secondary exposure of care providers during initial decontamination. 

If available, commercially prepared sterile irrigating solutions or amphoteric agents may be used for initial ocular lavage. In most prehospital settings, tap water is the only readily available option and should be used without delay, despite the risk of transient corneal edema related to hypotonicity. Tap water fulfills the fundamental requirements of an emergency ocular irrigating solution and is an appropriate first-line option in acute exposure scenarios.[45]

The timing of irrigation is more important than the choice of irrigating solution, and initiation of decontamination should never be delayed. Upon hospital arrival, ocular irrigation must be resumed and continued until the ocular surface pH reaches neutrality. Mild injuries may require approximately 2 L of irrigating fluid, whereas severe injuries may need up to 10 L. 

Irrigation should continue for a minimum of 30 minutes, and severe injuries may require 2 to 4 hours of continuous lavage to achieve adequate decontamination. Alkali injuries generally require larger volumes and longer irrigation than acid injuries because of deeper tissue penetration and prolonged retention. Lactated Ringer solution is the most commonly used irrigant due to widespread availability in emergency departments, although 0.9% sodium chloride or balanced salt solutions are also appropriate. Topical anesthesia may be administered to improve tolerance of prolonged irrigation.

Ocular surface pH should be rechecked with litmus paper after completion of irrigation, followed by meticulous removal of all residual particulate matter. Retained particles increase the risk of ongoing inflammation and progressive tissue injury. Particular attention is required for the superior fornix, with thorough single- and double-lid eversion to ensure complete clearance.

In cases of lime-related ocular injury in children or uncooperative adults, examination under anesthesia is mandatory to permit adequate fornix inspection and complete removal of residual material.[46] Severe eyelid burns may require escharotomy to permit eyelid closure and prevent exposure-related complications.

Management during the acute phase (days 0–7) and early reparative phase (days 8–21) centers on suppressing inflammation and promoting ocular surface reepithelialization. Injury severity determines the frequency of clinical evaluation and the intensity of therapy. Mild injuries may be managed with a topical antibiotic ointment and preservative-free artificial tears. More severe injuries require close monitoring for complications, including ocular surface exposure from adnexal scarring, corneal or stromal thinning, and increased IOP. 

Topical corticosteroids are used to reduce inflammation, and topical cycloplegic agents may be added for pain control. Systemic analgesics are often required during the acute phase as adjunctive therapy. Preservative-free artificial tears should be continued throughout all stages of healing.

Adjunctive systemic therapies include administration of tetracyclines, such as doxycycline 20 to 50 mg orally twice daily, and vitamin C 1,000 mg orally daily to support wound healing. Preservative-free topical antibiotics may be initiated for infection prophylaxis. Aminoglycosides, including topical gentamicin and tobramycin, should be avoided because of corneal epithelial toxicity. Erythromycin ophthalmic ointment is well tolerated, widely available, and appropriate for initial prophylaxis.

Medications to lower IOP may be required throughout the continuum of care. IOP spikes impair corneal healing during the acute and early reparative phases and warrant aggressive treatment. Chronic IOP elevation risks optic nerve damage and permanent glaucomatous vision loss.[47]

More severe burns often require advanced therapies, including the use of topical biologics such as autologous serum and platelet-rich plasma drops. Bandage contact lenses (BCLs) support epithelial healing and reduce pain from exposed corneal nerves, but antibiotic prophylaxis against Pseudomonas is mandatory when a lens is in place. Early AMT, preferably within the 1st week, should be considered in severe injuries. Tenonplasty may promote reepithelialization in cases of scleral ischemia or melting.[48]

Management during the late reparative phase (>21 days) focuses on inflammation control, visual rehabilitation, and ocular surface reconstruction. Conjunctival limbal autograft can restore limbal stem cells and establish a stable surface in preparation for keratoplasty. The choice of keratoplasty depends on the depth and extent of corneal scarring, with visual improvement as the primary objective. Symblepharon release, forniceal reconstruction, and eyelid surgery may be required during this phase for persistent exposure, functional impairment, or cosmetic deformity.

Management of ocular burns constitutes a true ophthalmic emergency and prioritizes rapid ocular surface restoration, inflammation suppression, infection prevention, and long-term visual rehabilitation. Treatment strategies are guided by burn type (chemical versus thermal), injury severity, and time since exposure, in accordance with national and international recommendations, including the AAO PPP, and informed by the Roper–Hall and Dua classification systems (see Staging).

Phase-Based Management of Ocular Burns

Management during the acute phase, encompassing the first minutes to 7 days after injury, centers on immediate and copious ocular irrigation initiated at the site of exposure and continued until ocular surface pH normalizes to 7.0 to 7.4. Clean water or any available isotonic solution, such as normal saline or lactated Ringer, may be used initially. Retained particulate matter must be removed following thorough eyelid eversion. Early medical therapy emphasizes epithelial healing, inflammation control, and prevention of secondary infection through broad-spectrum topical antibiotics, preservative-free lubricants, cycloplegics, and short-term topical corticosteroids. Adjunctive agents such as topical ascorbate and citrate reduce corneal melting, particularly in alkali burns.[49]

As epithelialization begins during the early reparative phase, typically 1 to 3 weeks after injury, therapy shifts toward limiting stromal degradation and supporting limbal recovery. Careful tapering of topical corticosteroids is required to avoid delayed epithelial healing. Oral doxycycline may be added for anti-collagenase effects. Persistent epithelial defects, limbal ischemia, or progressive thinning warrant biological surface support measures, including BCL use, AMT, or temporary tarsorrhaphy. Early AMT is strongly recommended by international guidelines in moderate-to-severe burns.

Management beyond 3 weeks addresses chronic sequelae, including LSCD, corneal scarring, symblepharon, DED, and secondary glaucoma. Long-term therapy relies on sustained lubrication, the use of topical immunomodulators such as cyclosporine, and IOP control. Surgical rehabilitation may involve LSCT, keratoplasty, ocular surface reconstruction, or keratoprosthesis in end-stage disease. Optimal outcomes often require coordinated care among cornea specialists, glaucoma services, and oculoplastic surgeons.

Key Concepts in Ocular Burn Care

Several core principles consistently govern guideline-based management of ocular burns. Immediate ocular irrigation takes absolute priority over all diagnostic investigations. Therapeutic intensity should escalate according to injury severity, as severity-based management is associated with improved clinical outcomes. Early AMT is recommended in moderate-to-severe burns to support ocular surface healing and reduce long-term sequelae. Long-term follow-up is essential for the detection and management of delayed complications.

Differential Diagnosis

Differential diagnosis of ocular burns encompasses a range of conditions that may mimic chemical injury but differ in etiology, clinical features, and progression. Infectious keratitis, whether bacterial or fungal, presents with focal corneal infiltrates, ulceration, purulent discharge, and hypopyon, typically following trauma or contact lens use without chemical exposure. Herpes simplex keratitis manifests as dendritic or geographic epithelial ulcers with reduced corneal sensation and characteristic fluorescein staining in the absence of any chemical exposure. Allergic conjunctivitis produces itching, papillae, chemosis, and bilateral involvement without epithelial defects or limbal ischemia. Mechanical corneal abrasions from fingernails, foreign bodies, or trauma cause sharp pain and linear epithelial defects with rapid healing, lacking progressive stromal damage or limbal blanching.

Radiation keratopathy develops after ionizing radiation, causing delayed epithelial breakdown, dry eye, and telangiectasia. Thermal eye injuries from fire, hot liquids, or explosions result in lid burns, singed lashes, and superficial corneal injury, typically with limited limbal involvement. Neurotrophic keratopathy due to trigeminal nerve dysfunction produces painless epithelial defects and poor healing without acute inflammatory signs. Stevens–Johnson syndrome and toxic epidermal necrolysis present with mucocutaneous lesions, pseudomembranes, and conjunctival scarring, often with systemic prodrome (see Image. Punctal Stenosis). Mild chemical conjunctivitis from irritants like smoke or chlorine vapor causes transient redness and tearing without stromal or limbal damage.

Autoimmune peripheral ulcerative keratitis from systemic vasculitis or rheumatoid arthritis presents with peripheral thinning and crescentic ulcers in a chronic course. Exposure keratopathy in patients in the intensive care unit with lagophthalmos produces inferior epithelial defects that improve with lubrication and lid closure. Contact lens–related keratitis produces central corneal infiltrates with positive cultures, usually associated with hypoxia or microbial contamination. Each condition may be distinguished from ocular burns by history, pattern of epithelial involvement, limbal ischemia, and the presence or absence of progressive stromal damage.

Pertinent Studies and Ongoing Trials

Severe ocular burns frequently lead to LSCD, chronic inflammation, corneal scarring, and vision loss. Over the past 2 decades, multiple clinical studies and trials have evaluated regenerative therapies designed to restore the ocular surface, suppress inflammation, and improve long-term visual outcomes. These therapies form the evidence base for current management strategies in moderate-to-severe ocular burns.

Amniotic Membrane Transplantation

Randomized, prospective studies show that AMT performed within 7 to 10 days of injury reduces inflammation, accelerates epithelial healing, and decreases symblepharon formation. A landmark prospective study by Dua et al reported faster epithelialization and improved ocular surface stability in acute chemical burns treated with AMT compared to conventional medical therapy, supporting its role as an early regenerative intervention rather than solely a reconstructive procedure.[50]

Limbal Stem Cell Transplantation

LSCT has proven effective in chronic ocular burns with LSCD. Trials evaluating conjunctival limbal autograft (CLAU), living-related conjunctival limbal allograft (lr-CLAL), and keratolimbal allograft (KLAL) consistently demonstrate improved corneal epithelial integrity and visual acuity. Long-term studies report success rates of 60% to 80%, particularly when preoperative inflammation is well controlled, providing strong evidence for staged regenerative reconstruction in severe burns.[51]

Cultivated Limbal Epithelial Transplantation

Cultivated limbal epithelial transplantation (CLET) is a significant advance in regenerative therapy. Multicenter studies, including trials by Pellegrini et al, show stable corneal epithelialization and sustained visual improvement in unilateral chemical burns treated with ex vivo–expanded limbal epithelial cells. This approach minimizes donor site morbidity and is now an evidence-based recommendation for unilateral LSCD.[52]

Simple Limbal Epithelial Transplantation

Simple limbal epithelial transplantation (SLET) has emerged as a cost-effective, single-stage alternative to CLET. Prospective studies from countries such as India report anatomical success rates exceeding 75% in unilateral chemical burns. Ongoing trials are evaluating the technique's application in partial LSCD and pediatric burns, supporting its increasing integration into clinical practice.

Adjunctive Regenerative Therapies

Randomized trials assessing therapies involving autologous serum eye drops, platelet-rich plasma, and topical growth factor demonstrate improved epithelial healing, tear film stability, and patient comfort in chronic postburn ocular surface disease. These findings underscore the value of biologic adjuvants in long-term rehabilitation.

Ongoing and Emerging Trials

Current investigations focus on mesenchymal stem cell therapy, gene-based antifibrotic modulation, and bioengineered corneal substitutes for end-stage ocular burns. Early-phase results indicate potential benefits in reducing stromal scarring and enhancing corneal clarity, although long-term safety and efficacy remain under evaluation.

Clinical Relevance and Rationale for Regenerative Therapies

Evidence from these studies confirms that early ocular surface regeneration and staged stem cell–based reconstruction markedly improve anatomical outcomes, reduce complications, and enhance visual rehabilitation following ocular burns. This robust evidence base supports regenerative therapies as a fundamental component of contemporary ocular burn management.

Treatment Planning

Treatment planning in ocular burns is a dynamic, staged, and severity-dependent process, with the goals of preserving globe integrity, restoring the ocular surface, preventing long-term sequelae, and optimizing visual rehabilitation. Management is individualized according to injury type, severity, extent of LSCD, and phase of injury.

During the acute phase, objectives include rapid neutralization of the offending agent, suppression of inflammation, infection prevention, and promotion of epithelial healing. Immediate, copious irrigation followed by intensive topical therapy—lubricants, antibiotics, cycloplegics, corticosteroids, and antiglaucoma medications as indicated—forms the foundation of care. Early AMT is strongly recommended in moderate-to-severe burns to reduce inflammation and limit scarring.[53]

In the early reparative phase, treatment focuses on maintaining epithelial stability, assessing limbal function, and preventing cicatricial complications such as symblepharon, fornix shortening, and corneal neovascularization. Adjunctive therapies incorporating autologous serum eye drops, BCLs, or systemic immunomodulation may be employed. Serial reassessment of LSCD informs the need for further regenerative or reconstructive interventions.[54]

In the chronic phase, treatment planning shifts to ocular surface reconstruction and visual rehabilitation. Patients with partial or total LSCD require regenerative procedures such as SLET, CLET, CLAU, or KLAL, selected based on laterality and severity. Corneal transplantation, whether performed by lamellar or penetrating keratoplasty, is performed only after establishing a stable, inflammation-free ocular surface. Staged correction of associated eyelid and adnexal abnormalities may be necessary.

Long-term management focuses on monitoring for glaucoma, DED, recurrent epithelial breakdown, and graft survival. Interprofessional care involving cornea specialists, oculoplastic surgeons, glaucoma services, and rehabilitation teams is essential for optimizing outcomes. Key principles guiding treatment planning include early, aggressive intervention to improve prognosis, prioritization of regenerative therapies before optical keratoplasty, strict inflammation control before definitive surgery, and ongoing reassessment with staged interventions at every phase.[55]

Toxicity and Adverse Effect Management

Management of ocular burns demands vigilant monitoring for both treatment-related toxicity and disease-related complications, as chemical injury and prolonged use of intensive topical or systemic therapies can contribute to ocular and systemic adverse effects. Effective toxicity control is essential to preserve ocular integrity, prevent secondary damage, and optimize long-term visual outcomes.

Ocular Toxicity from Topical Drugs

Topical corticosteroids are essential for controlling acute inflammation but can cause delayed epithelial healing, corneal thinning, steroid-induced glaucoma, cataract formation, and increased infection risk if used inappropriately or persistently. High-potency steroids should be applied early and tapered within 7 to 14 days, with regular IOP monitoring. Subacute therapy may involve switching to lower-potency steroids or immunomodulators such as cyclosporine or tacrolimus.[56] 

Long-term use of broad-spectrum topical antibiotics can induce epithelial toxicity, allergic reactions, and disruption of normal ocular surface flora. Antibiotic prophylaxis should be limited to the necessary duration, rotated according to clinical response, and discontinued once epithelial integrity is restored.[57]

Cycloplegics and mydriatics may cause photophobia, blurred vision, increased IOP in susceptible patients, and systemic anticholinergic effects, particularly in children. Use the lowest effective dose, avoid prolonged administration in patients with narrow angles, and monitor systemic effects in pediatric patients and older adults.[58]

Adverse Effects of Systemic Therapy

Systemic steroids may be required for severe inflammation but pose risks of hyperglycemia, hypertension, immunosuppression, osteoporosis, and gastrointestinal complications. Duration and dose should be minimized, with gradual tapering to avoid adrenal suppression, and patients should be screened for diabetes, hypertension, and infection.[59] Immunosuppressive agents are indicated for severe inflammation or allograft recipients and can cause renal, hepatic, and hematologic toxicity. Baseline and periodic blood counts and liver and renal function tests are essential, with close coordination with internists or rheumatologists.[60]

Corneal Complications Due to Ocular Burns

Corneal complications after ocular burns include persistent epithelial defects, stromal melting, perforation, neovascularization, and scar formation. Management strategies consist of intensive lubrication, autologous serum application, early AMT, and the use of collagenase inhibitors such as doxycycline or ascorbate.[61] LSCD leads to chronic epithelial instability, conjunctivalization, and vision loss. Early recognition and timely stem cell–based reconstruction using SLET, CLET, or CLAU are essential. Secondary glaucoma may result from chemical injury or steroid use, causing trabecular damage and elevated IOP. Management requires frequent IOP monitoring, use of aqueous suppressants, and surgical intervention if medical therapy fails.[62]

Possible Complications of Surgery

AMT carries risks of membrane displacement, infection, and recurrent inflammation. Management involves secure fixation and strict postoperative monitoring. LSCT may result in graft failure, rejection, or infection. Management requires adequate immunosuppression and early detection of rejection signs.[63]

Monitoring and Prevention Strategies

Monitoring and prevention in ocular burns focus on preserving visual function, maintaining corneal integrity, controlling IOP, and detecting systemic or treatment-related toxicity. Visual acuity should be assessed at every visit to evaluate functional status. Corneal integrity requires daily to weekly checks to identify epithelial defects early. IOP should be measured weekly during the initial phase to prevent glaucoma. Inflammatory activity should be monitored as indicated to guide steroid tapering. Systemic laboratory tests should be performed periodically to detect therapy-related toxicity.

Preventive principles emphasize time-limited, targeted therapy with judicious steroid tapering, prioritization of regenerative over optical surgery, and patient education on early warning signs. Early toxicity surveillance can prevent most vision-threatening complications. Persistent epithelial defects indicate impending corneal melt, and long-term outcomes depend on maintaining a balance between inflammation control and epithelial healing.[64]

Staging

Formal severity grading is essential in the treatment of ocular burns, as it guides prognosis and management.[65] The most widely accepted systems are the Roper–Hall and Dua classifications, the latter offering greater prognostic accuracy and AAO endorsement. These statification systems evaluate the extent of limbal ischemia and corneal involvement—critical determinants of epithelial healing and long-term visual prognosis—and provide a standardized framework for treatment planning and comparison of outcomes across studies.

Roper–Hall Classification

The Roper–Hall classification, also known as the modified Hughes classification, is a simple and widely used system that categorizes ocular burns according to corneal clarity and the extent of limbal ischemia.[66] Key features and prognostic outcomes of ocular burns according to this system are as follows:

• Grade I: Corneal epithelial damage is present, but the cornea remains clear. Limbal ischemia is absent, and the prognosis is excellent.
• Grade II: Corneal haze is present, but iris details remain visible. Limbal ischemia involves less than 1/3 of the limbus, and the prognosis is good.
• Grade III: Total epithelial loss occurs, with stromal haze obscuring iris details. Limbal ischemia affects 1/3 to 1/2 of the limbus, and the prognosis is guarded (see Image. Digital Slit Lamp Image of Ocular Chemical Burn).
• Grade IV: The cornea is opaque, preventing visualization of the iris or pupil. Limbal ischemia involves more than 1/2 of the limbus, and the prognosis is poor.

Grades I and II typically resolve with medical therapy alone. In contrast, grades III and IV frequently necessitate surgical interventions, such as AMT or LSCT.

Dua Classification

The Dua classification offers a more detailed and reproducible assessment, particularly in severe chemical burns, by quantifying limbal involvement in clock hours and conjunctival injury as a percentage (see Image. Dua Classification of Ocular Surface Burns). Severity stratification according to this framework is as follows:

• Grade I has no limbal or conjunctival involvement and carries a very good prognosis.
• Grade II involves up to 3 clock hours of the limbus and up to 30% of the conjunctiva, with a good prognosis.
• Grade III involves more than 3 and up to 6 clock hours of the limbus and 30% to 50% of the conjunctiva, with a prognosis ranging from good to guarded.
• Grade IV involves more than 6 and up to 9 clock hours of the limbus and 50% to 75% of the conjunctiva, with a guarded prognosis.
• Grade V involves more than 9 but less than 12 clock hours of the limbus and 75% to 100% of the conjunctiva, with a poor prognosis.
• Grade VI involves 12 clock hours of the limbus (total) and 100% of the conjunctiva, with a very poor prognosis. 

The Dua classification provides better interobserver agreement and more accurate prediction of LSCD. This system also enhances utility in research and guides surgical decision-making.[67]

Phase-Based Staging

Ocular burns are classified not only by anatomical severity but also by temporal phase, which directs therapeutic priorities. The acute phase (days 0–7) features inflammation, epithelial loss, and ischemia, with management focused on irrigation and inflammation control. The early reparative phase (weeks 1–3) involves epithelial healing and stromal repair, emphasizing prevention of melting and promotion of recovery. The late reparative phase (beyond 3 weeks) is characterized by scar formation, LSCD, and glaucoma, with attention directed toward visual rehabilitation.

Clinical Importance of Staging

Staging of ocular burns informs treatment urgency and intensity, predicts visual prognosis and complication risk, guides surgical timing, and allows standardized reporting in clinical studies. The Roper–Hall classification is practical for routine use, while the Dua classification provides superior prognostic accuracy in moderate-to-severe burns. Early, accurate staging combined with ongoing reassessment underpins optimal management.[68]

Prognosis

Two stratification systems assess prognosis in ocular burns based on early evaluation and burn characteristics. The Roper–Hall classification grades injuries from I to IV using corneal clarity and the extent of limbal ischemia. The Dua system assigns grades from I to VI based on the number of limbal clock hours involved and the percentage of conjunctival involvement. Higher grades indicate poorer prognosis in both frameworks. The Roper–Hall system was introduced in 1965, and the Dua system was published in 2001.

Despite advances in medical management, these classifications remain valuable for evaluating injury severity and predicting outcomes. Hazy corneas, extensive limbal ischemia, and greater conjunctival involvement indicate a worse prognosis. Limbal ischemia may not be fully apparent at initial presentation and often requires repeated examinations of the stained limbus. Increasing limbal ischemia correlates with a higher risk of conjunctivalization, a process in which conjunctival-like tissue covers the cornea, resulting in opacification.[69]

Complications

Ocular burns are some of the most severe ophthalmic emergencies, producing a broad spectrum of acute, subacute, and chronic complications. Severity and outcomes depend on the type of offending agent (alkali worse than acid), duration of exposure, extent of limbal ischemia, and effectiveness of early management. Complications may affect the ocular surface, cornea, anterior and posterior segments, adnexa, and visual axis, frequently resulting in long-term visual morbidity.[70]

Acute Complications

Acute effects of ocular burns develop within hours to days. These conditions result from chemical toxicity, intense inflammation, and ischemia, progressing rapidly if not promptly addressed.[71]

Persistent epithelial defects arise from toxic epithelial loss and impaired regeneration, increasing the risk of infection and stromal melt. Corneal edema results from endothelial dysfunction and inflammation, reducing visual acuity. Limbal ischemia caused by vascular thrombosis and tissue necrosis serves as a predictor of poor prognosis. Raised IOP due to trabecular meshwork damage and inflammation may lead to secondary glaucoma. Anterior uveitis, reflecting breakdown of the blood–aqueous barrier, produces pain and photophobia. Corneal infiltrates from secondary infection or inflammation increase the risk of ulceration. Eyelid edema and chemosis represent manifestations of the acute inflammatory response.

Subacute Complications

Subacute consequences of ocular burns develop over days to weeks during the reparative phase. These adverse effects are primarily related to imbalanced healing, stromal degradation, and abnormal fibrovascular responses.

Corneal stromal melt results from collagenase and protease activation and carries a high risk of perforation. Progressive stromal thinning may culminate in corneal perforation, constituting an ocular emergency. Symblepharon formation arises from conjunctival scarring and adhesion, leading to restricted ocular motility. Persistent inflammation due to inadequate immune suppression delays epithelial and stromal healing. Secondary infection occurs in the setting of compromised ocular surface defense and increases the risk of endophthalmitis. Iris atrophy caused by ischemia and inflammation may result in pupil irregularity and glare.

Chronic Complications

Chronic sequelae of ocular burns develop over weeks to months or years. These manifestations represent the principal determinants of long-term visual outcome, frequently necessitating complex reconstructive intervention.

LSCD results from the destruction of the limbal niche and leads to chronic epithelial breakdown with persistent ocular surface instability. Corneal scarring and opacity arise from stromal fibrosis and often cause permanent visual loss. Corneal neovascularization driven by chronic hypoxia and inflammation compromises corneal clarity and increases the risk of graft failure. DED develops due to loss of conjunctival goblet cells and lacrimal gland dysfunction, further destabilizing the ocular surface.

Symblepharon and ankyloblepharon reflect severe conjunctival fibrosis and result in significant functional limitation and cosmetic impairment. Secondary glaucoma caused by angle damage and scarring leads to progressive optic neuropathy. Cataract formation associated with inflammation and prolonged corticosteroid use contributes to reduced vision. Band keratopathy develops from chronic epithelial and metabolic imbalance and may involve the visual axis. In severe cases, irreversible tissue destruction may culminate in phthisis bulbi and loss of the eye.

Additional chronic sequelae include persistent inflammation and pain resulting from ongoing immune activation and ocular surface instability. Sympathetic ophthalmia may occur due to immune sensitization to exposed ocular antigens. Hypotony can develop as a consequence of ciliary body dysfunction or extensive structural damage. 

Other Adverse Effects of Ocular Burns

Complications involving the posterior segment and optic nerve pathways are uncommon but may occur in severe injuries reaching the deeper ocular structures. Vitritis may develop secondary to severe intraocular inflammation. Retinal ischemia results from vascular compromise and can lead to irreversible visual loss. Optic neuropathy may arise from direct toxic effects or ischemic injury to the optic nerve. Choroidal damage can occur following penetrating chemical injury, further contributing to poor visual outcomes.

Psychosocial and quality-of-life complications frequently accompany ocular burns, particularly in cases with chronic visual impairment. Cosmetic disfigurement may contribute to social withdrawal and diminished self-esteem. Recurrent surgical interventions and prolonged rehabilitation impose substantial physical and emotional burdens. Psychological distress and reduced work productivity further compound the long-term impact of these injuries.

Postoperative and Rehabilitation Care

Postoperative and rehabilitation care following ocular burns is a prolonged, staged, and interprofessional process directed toward restoration of ocular surface stability, visual function, eyelid anatomy, and quality of life. Care intensity and duration vary according to burn severity, extent of LSCD, type of surgical intervention performed, and degree of associated adnexal involvement.

Immediate postoperative care during the first 1 to 2 weeks emphasizes control of inflammation, promotion of epithelial healing, prevention of infection, and preservation of graft integrity. Broad-spectrum topical antibiotics administered 4 to 6 times daily reduce the risk of secondary infection. Topical corticosteroids are used to suppress inflammation, with tapered dosing under close clinical monitoring. Intensive lubrication with preservative-free artificial tears supports epithelial recovery and ocular surface stability. Cycloplegic agents such as atropine or homatropine reduce pain and intraocular inflammation. Regular IOP monitoring with tonometry at each visit facilitates early detection of secondary glaucoma. Use of a BCL or AMT provides mechanical protection of the ocular surface and reduces the risk of epithelial breakdown.

Intermediate postoperative care occurs over weeks to months, focusing on ocular surface reconstruction, prevention of cicatrization, and visual rehabilitation. Persistent epithelial defects may be managed with autologous serum instillation or AMT to promote surface healing. Symblepharon formation is addressed through mechanical lysis using glass rod sweeping and placement of a symblepharon ring to prevent readhesion. DED is managed with intensive lubrication and punctal occlusion to improve tear retention. Recurrence of inflammation requires judicious use of topical corticosteroids or immunomodulatory agents. Early corneal scarring and neovascularization may be mitigated with targeted antineovascular therapy, using agents such as anti–vascular endothelial growth factor.

Long-term rehabilitation following ocular burns focuses on restoring functional vision and preventing recurrence of ocular surface disease. LSCD may be addressed with SLET, CLET, or KLAL. Corneal opacity may be treated with lamellar or penetrating keratoplasty. Severe DED is managed with scleral contact lenses, such as PROSE (Prosthetic Replacement of the Ocular Surface Ecosystem) devices. Eyelid malpositions require lid reconstruction surgery, while visual impairment may benefit from low-vision aids and counseling.

Rigid gas-permeable or scleral lenses enhance vision and protect the ocular surface, often preceding surgical intervention. Low-vision rehabilitation services are essential for bilateral or severe burns.[72] Adnexal and cosmetic rehabilitation includes correction of entropion, ectropion, or trichiasis, as well as symblepharon release and fornix reconstruction. Cosmetic rehabilitation substantially improves psychosocial outcomes and quality of life.[73] Patient education and follow-up include lifelong monitoring for severe burns, strict compliance with medications, avoidance of secondary trauma and toxic exposures, and counseling on realistic visual expectations.

Consultations

Ophthalmology is essential in the management of acute chemical burns to the eye or ocular adnexa. Consultation with plastic surgery, otorhinolaryngology, or oral and maxillofacial surgery may be required for associated facial burns. Ocular burns constitute true ophthalmic emergencies and demand early, structured interprofessional involvement to minimize ocular morbidity and systemic complications. Immediate evaluation by an ophthalmologist, preferably a cornea and ocular surface specialist, ensures accurate assessment of injury severity, standardized grading, initiation of aggressive irrigation and medical therapy, and determination of the need for surgical interventions such as AMT or LSCT. Early subspecialty involvement enhances epithelial healing, reduces inflammation, and decreases the risk of long-term ocular surface failure.[74]

Oculoplastic and adnexal surgeons should be consulted for involvement of eyelid skin, lashes, conjunctival fornices, or lacrimal drainage structures. Early identification and management of eyelid burns, cicatricial changes, lagophthalmos, or symblepharon are essential to prevent exposure keratopathy and progressive ocular surface damage. In cases of periocular or facial burns, collaboration with plastic or burn surgeons ensures coordinated reconstruction and wound care.[75]

Secondary glaucoma commonly develops after chemical burns due to trabecular meshwork damage, inflammation, or steroid response; consultation with a glaucoma specialist is recommended when IOP elevation or angle abnormalities are identified. Retina specialists may be required for severe injuries complicated by posterior segment ischemia, vitreous inflammation, or retinal detachment.

To ensure safe evaluation and treatment, an anesthesiology consultation is often required for pediatric patients, uncooperative individuals, or those needing repeated detailed examinations or early surgical intervention. Emergency medicine physicians and toxicologists should be involved in cases of severe chemical exposure, exposure to unknown substances, or systemic toxicity. Occupational health specialists may be consulted for work-related injuries to support reporting, risk assessment, and preventive counseling.[76][77]

During the subacute and chronic phases, optometrists and contact lens specialists contribute to visual rehabilitation through fitting and management of scleral lenses, PROSE devices, or specialty BCLs. Low-vision rehabilitation teams should be engaged early in patients with permanent visual impairment to optimize functional independence. Psychiatric services and social workers play a critical role for individuals with assault-related injuries, self-harm, or significant psychosocial distress, supporting holistic recovery and long-term adherence to care.[78]

Deterrence and Patient Education

Deterrence and patient education are essential to reducing the incidence, severity, and long-term morbidity of ocular burns. Given that the majority of ocular burn injuries are preventable, targeted education at individual, occupational, and community levels plays a critical role in primary prevention.

Public health education should focus on children, adolescents, and young adults, who are disproportionately affected by accidental and recreational chemical injuries. Community awareness programs, school safety campaigns, and workplace training modules effectively reduce injury incidence. Advocacy for regulatory controls, safer chemical packaging, and clear hazard labeling enhances prevention at the population level.

Injury prevention in the home involves restricting young children's access to hazardous chemicals. Childproofing measures require healthcare providers to educate parents of infants and young children on strategies to reduce risk. Workplace prevention is multifaceted, including the use of adequate PPE, worker familiarity with handled chemicals, and legally mandated on-site decontamination capabilities. Workers must be trained in the location and proper use of decontamination stations. Periodic hazardous materials training, including decontamination techniques, should be provided in settings with potential chemical exposure.[79]

Counseling should emphasize the high-risk nature of chemical exposures, particularly alkaline substances found in household cleaning agents, industrial chemicals, agricultural products, and construction materials. Consistent use of protective eyewear, including safety goggles or face shields, is vital during high-risk activities at home, school, and the workplace. Strict adherence to occupational safety regulations, appropriate labeling, and ready availability of eye-wash stations must be reinforced in industrial and laboratory settings.

Immediate first-aid training is crucial and should be reinforced consistently. Patients, family members, teachers, and workplace supervisors must be instructed to begin copious irrigation with clean water or saline immediately after chemical exposure, without waiting for medical assistance or attempting neutralization. Delayed irrigation is a major modifiable factor contributing to poor visual outcomes. Educational materials should emphasize continuation of irrigation until professional care is available.

Postinjury counseling must address strict adherence to prescribed medications, follow-up schedules, and recognition of warning signs such as increasing pain, redness, photophobia, discharge, or sudden visual deterioration. Avoidance of self-medication and the use of unprescribed topical agents or traditional remedies should be emphasized, as these practices can exacerbate inflammation and delay healing. Patients should be informed about the potential need for long-term surveillance, given the risk of LSCD, secondary glaucoma, DED, or corneal scars developing over time.

Structured patient education, combined with deterrence strategies, decreases the incidence of ocular burns, improves clinical outcomes, strengthens patient engagement, and mitigates long-term visual disability. Targeted education at the individual, occupational, and community levels plays a pivotal role in primary prevention, as the majority of ocular burn injuries are preventable.[80]

Pearls and Other Issues

Clinical Pearls

Immediate and copious ocular irrigation is the single most important intervention in ocular burns and should begin at the site of exposure, even before detailed examination or chemical identification can be performed. Early control of inflammation significantly reduces stromal melt and LSCD. Alkali burns penetrate ocular tissues more rapidly and deeply than acid burns, resulting in worse long-term outcomes.

Limbal ischemia and corneal involvement at presentation are stronger predictors of prognosis than initial visual acuity. Frequent reassessment during the acute phase is essential, as clinical severity may evolve despite early treatment. Many complications are preventable with timely irrigation and staged management.

Disposition Considerations

Patients with moderate-to-severe ocular burns require an urgent ophthalmology consultation and frequently necessitate inpatient care for close monitoring, intensive topical therapy, and timely surgical intervention. Mild burns may be managed on an outpatient basis but still warrant vigilant follow-up to detect delayed complications, including secondary glaucoma, infection, or epithelial breakdown. Early referral to tertiary centers is recommended for extensive limbal damage or bilateral involvement.

Common Pitfalls

The primary pitfalls in the initial management of ocular burns include delayed irrigation, attempted chemical neutralization, underestimation of injury severity—particularly in alkali burns—and poor adherence to follow-up or premature discontinuation of therapy. All of these missteps can worsen outcomes and lead to irreversible corneal scarring and vision loss.

Inadequate debridement of particulate matter, especially from the superior fornix, perpetuates inflammation. Effective hospital-based irrigation may be facilitated using a commercially available lens connected to intravenous tubing for hands-free delivery. If unavailable, thorough irrigation requires an attendant at the patient’s side. Topical anesthesia is almost always necessary during irrigation and assessment.

Prevention and Additional Issues

Most ocular burns are preventable through the use of protective eyewear, proper chemical storage, and strict enforcement of workplace safety regulations. Public education on immediate first-aid irrigation and prompt medical evaluation is essential. Long-term complications, including DED, LSCD, and ocular surface failure, highlight the importance of patient counseling and ongoing surveillance.[81]

Enhancing Healthcare Team Outcomes

The continuum of care for an ocular chemical burn often begins with activation of emergency medical services. Prehospital providers must ensure a safe environment through adequate decontamination of both the patient and the surroundings. Early communication with the hospital team should include vital information, such as patient stability, mental status, airway concerns, the suspected extent of injury, and, if known, the chemical agent, enabling the emergency department to prepare for arrival.

After stabilization, ocular irrigation, decontamination, and injury assessment, ophthalmology consultation should be initiated to guide further care. Early involvement of ophthalmology optimizes outcomes during the initial management phase, typically provided by a generalist such as an emergency medicine physician. Coordination with the hospital pharmacist may be necessary to secure access to appropriate therapeutic agents during the acute phase.[82] 

Optimal management of ocular burns requires a coordinated, interprofessional approach to minimize vision loss, prevent complications, and support long-term ocular surface rehabilitation. Early recognition, rapid intervention, and seamless communication among healthcare professionals are essential to improve patient-centered outcomes and safety.[83]

Emergency physicians play a critical role in immediate triage and initiation of copious ocular irrigation, which must never be delayed for diagnostic confirmation. Ophthalmologists are responsible for grading injury severity, directing acute medical and surgical management, monitoring for complications, and planning staged reconstructive interventions. Ethical responsibilities include obtaining informed consent, providing realistic prognostic counseling, and prioritizing sight-saving treatments in time-sensitive scenarios.[84]

Advanced practitioners facilitate early assessment, documentation of injury severity, initiation of protocol-based therapy, and close follow-up. These clinicians ensure continuity of care by promoting adherence to treatment plans, recognizing early signs of deterioration, and escalating care when required. The contributions of advanced practitioners are pivotal in patient education and the coordination of outpatient and inpatient services.[85]

Nurses are central to delivering timely irrigation, administering medications, monitoring IOP, and ensuring compliance with intensive topical regimens. Skilled nursing care enhances patient safety by identifying medication errors, monitoring pain control, and providing psychological support. Nurses also reinforce education on eye protection, medication adherence, and the importance of follow-up.

Pharmacists contribute by verifying drug selection, dosing, and compatibility of topical and systemic agents. The role of these healthcare professionals includes preventing toxicity, recommending preservative-free formulations, and counseling patients on correct medication use, thereby reducing adverse drug events and improving therapeutic effectiveness.[86]

Collaboration with occupational health specialists, toxicologists, and burn specialists is often necessary, particularly in industrial or chemical exposures. Rehabilitation specialists and optometrists support visual rehabilitation, prosthetic management, and long-term functional recovery. Social workers facilitate access to care, workplace reporting, and rehabilitation resources.

Clear, structured communication using standardized handoff tools enhances decision-making and minimizes delays in care. Interprofessional team meetings are valuable for complex cases requiring surgical reconstruction or long-term rehabilitation. Ethical care coordination ensures equitable access to specialized services and advocates for injury prevention strategies.

A team-based approach improves visual outcomes, reduces complications such as LSCD and glaucoma, enhances patient satisfaction, and supports long-term functional recovery. Interprofessional collaboration transforms ocular burn management from acute crisis intervention into a continuum focused on prevention, restoration, and quality of life.[87]

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Disclosure: Gregory Patek declares no relevant financial relationships with ineligible companies.

Disclosure: Amanda Bates declares no relevant financial relationships with ineligible companies.

Disclosure: Bharat Gurnani declares no relevant financial relationships with ineligible companies.