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Control of retinal and choroidal blood flow
1Department of Physiology and Medical Biophysics, University of Uppsala, Sweden.
Eye (London, England)
|January 1, 1990
Summary
Light affects retinal metabolism and blood flow. Flickering light increases inner retinal metabolism and retinal blood flow, while constant light reduces outer retinal metabolism, impacting ocular blood supply regulation.
Area of Science:
- Ophthalmology
- Neuroscience
- Physiology
Background:
- Retinal and choroidal blood flow are crucial for vision.
- Retinal blood vessels are autoregulated; choroidal vessels are not.
- Autonomic nerves and neuropeptides influence ocular blood flow.
Purpose of the Study:
- To review previous studies on retinal and choroidal blood flow control.
- To report preliminary observations on light's effects on retinal metabolism and blood flow in monkeys.
- To explore the roles of autonomic nerves and neuropeptides in ocular circulation.
Main Methods:
- Review of existing literature.
- Deoxyglucose method (Sokoloff) to measure retinal metabolism.
- Observation of retinal and choroidal blood flow in Macaca fascicularis under different light conditions.
Main Results:
- Flickering light (8 Hz) increases inner retinal metabolism and retinal blood flow compared to constant light.
- Constant light decreases outer retinal metabolism.
- Sympathetic nerves may protect the choroid from overperfusion; parasympathetic fibres' role is unclear.
Conclusions:
- Light intensity and pattern significantly impact retinal metabolism and blood flow.
- Autonomic innervation and neuropeptides (NPY, VIP, PHI) likely play roles in regulating ocular circulation.
- Further research is needed to elucidate the physiological significance of these findings for visual health.