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Functional damage to inner and outer retinal cells in experimental glaucoma.
Dorit Raz1, Ido Perlman, Christine L Percicot
1Koret School of Veterinary Medicine, Hebrew University of Jerusalem, Rehovot, Israel. razdo@nidcd.nih.gov
Investigative Ophthalmology & Visual Science
|July 29, 2003
Summary
Glaucoma damages both inner and outer retinal cells, with inner retinal function significantly impaired, affecting multifocal electroretinography (mfERG) responses. Outer retinal delays were also observed in glaucomatous monkey eyes.
Area of Science:
- Ophthalmology
- Neuroscience
- Retinal Physiology
Background:
- Glaucoma is a leading cause of irreversible blindness.
- Multifocal electroretinography (mfERG) assesses retinal function.
- Understanding cellular sources of mfERG changes in glaucoma is crucial.
Purpose of the Study:
- To identify the specific retinal cell types contributing to mfERG abnormalities in glaucoma.
- To compare retinal function between normal and glaucomatous monkey eyes using mfERG.
Main Methods:
- Measured mfERG responses (K1 and K2) in normal and glaucomatous cynomolgus monkey eyes.
- Used pharmacological agents (GABA, glycine, APB) to isolate inner and outer retinal contributions.
- Assessed responses at different luminance levels.
Main Results:
- Inner retinal components were attenuated in glaucomatous eyes, correlating with K1 response changes.
- Outer retinal components showed delayed latencies in glaucomatous eyes.
- K2 responses, dominated by inner retinal function, were diminished in glaucoma.
Conclusions:
- Both inner and outer retinal functions are compromised in glaucoma, with inner retinal dysfunction being more pronounced.
- Glaucomatous eyes retain some inner retinal activity even at advanced stages.
- K2 mfERG responses are more sensitive to glaucomatous damage than K1 responses.