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Eye (Lond). 2011 Dec;25(12):1546-54. doi: 10.1038/eye.2011.264. Epub 2011 Oct 21.

Regression of early diabetic macular oedema is associated with prevention of dark adaptation.

Author information

1
School of Community and Health Sciences, City University, London, UK. geoffreyarden@aol.com

Abstract

HYPOTHESIS:

Dark-adapted rods consume oxygen at high rates and light adaptation decreases this oxygen burden and can have therapeutic effects on diabetic macular oedema (DMO).

METHODS:

Patients with mild non-proliferative diabetic retinopathy (DR) and early, untreated non-sight-threatening DMO slept for 6 months wearing masks that illuminated the eyelid of one closed eye by 505 nm light. Exclusion criteria were any concomitant eye disease, DR >ETDRS grade 35, and other systemic diseases.

PRIMARY OUTCOME:

change of OCT retinal thickness in the local region where oedema was present.

RESULTS:

A total of 34 out of 40 patients completed the study. Mean baseline OCT macular cube thickness was equivalent for study and fellow eyes. But study eyes had a greater mean thickness in the central subfield zone 1 (282±53 μm) vs (256±19 μm) the fellow eyes. Twenty-eight study eyes showed intraretinal cysts compared with nine in the fellow eyes. At 6 months, only 19 study eyes had cysts while cysts were seen in 20 fellow eyes. After 6 months, the worst affected ETDRS zone and the central subfield zone 1 reduced in thickness in study eyes only by 12 μm (95% CI 20 to -7, P=0.01). The secondary outcomes of change in visual acuity, achromatic contrast sensitivity, and microperimetric thresholds improved significantly in study eyes and deteriorated in fellow eyes.

CONCLUSIONS:

Sleeping in dim light that can keep rods light adapted may reverse the changes of DMO.

PMID:
22020171
PMCID:
PMC3234487
DOI:
10.1038/eye.2011.264
[Indexed for MEDLINE]
Free PMC Article

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