ClinicalVan Herick’s test at a cut-off of ≤ 25% has a reasonable sensitivity and specificity across the two studies for measuring anterior chamber angle. However the evidence is limited because both studies were in Asian/Indian populations with a higher prevalence of narrow angles and one study was of lower methodological quality. (LOW QUALITY)
The flashlight test has a moderate sensitivity and specificity when a third-shadow is used as the cut-off for measuring anterior chamber angle but has a low sensitivity for a cut-off of a half-shadow. However the evidence is limited because both studies were in Asian/Indian populations with a higher prevalence of narrow angles. (MODERATE QUALITY)
Scanning Peripheral Anterior Chamber Depth analyser (SPAC) at a cut-off of suspect angle closure or potential angle closure has a moderate sensitivity and specificity for measuring anterior chamber angle. However the evidence is limited because both studies were in Asian/Indian populations with a higher prevalence of narrow angles. (MODERATE QUALITY)
Non-contact anterior segment optical coherence technology (AS-OCT) at a cut off ≥1 closed quadrant has a high sensitivity but low specificity for measuring anterior chamber angle. However the evidence is limited because both studies were in Asian/Indian populations with a higher prevalence of narrow angles. (MODERATE QUALITY)
EconomicVan Herick’s test, A-scan, B-scan and OCT are less costly than Gonioscopy when the cost of false positives and false negatives are not taken into account. This evidence has serious limitations and direct applicability.

From: 4, Diagnosis of patients with ocular hypertension, chronic open angle glaucoma and suspected chronic open angle glaucoma

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Glaucoma: Diagnosis and Management of Chronic Open Angle Glaucoma and Ocular Hypertension.
NICE Clinical Guidelines, No. 85.
National Collaborating Centre for Acute Care (UK).
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