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Hyperoxia improves contrast sensitivity in early diabetic retinopathy
1Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, USA.
The British Journal of Ophthalmology
|March 1, 1996
Summary
Diabetic retinopathy's early visual deficits are reversible. Breathing pure oxygen improved contrast sensitivity in diabetic patients, suggesting tissue hypoxia contributes to vision and blood vessel problems.
Area of Science:
- Ophthalmology
- Diabetology
- Vascular Biology
Background:
- Diabetic retinopathy causes unknown vascular and visual pathology.
- Retinal hypoxia is a potential contributing factor.
- Early diabetes may present with reduced contrast sensitivity and altered retinal blood flow.
Purpose of the Study:
- To investigate the role of retinal hypoxia in early diabetic retinopathy.
- To determine if 100% oxygen breathing normalizes contrast sensitivity and retinal blood flow in diabetic patients.
- To test the hypothesis that hypoxia initiates visual and vascular dysfunction.
Main Methods:
- 12 diabetic patients with minimal retinopathy and reduced contrast sensitivity were studied.
- Retinal arteriovenous dye transit time was measured.
- The effect of 100% oxygen breathing (isocapnic hyperoxia) on contrast sensitivity and dye transit was assessed.
Main Results:
- Hyperoxia significantly improved contrast sensitivity in diabetic patients to normal levels.
- Improvement in contrast sensitivity correlated with the initial defect's severity.
- Hyperoxia slowed retinal arteriovenous transit in controls but not in diabetic patients.
Conclusions:
- Early contrast sensitivity deficits in diabetes mellitus are reversible.
- Results support the hypothesis that hypoxia-related factors initiate visual and vascular dysfunction in diabetic retinopathy.
- Oxygen therapy may hold potential for managing early-stage diabetic retinopathy.