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Related Experiment Videos

Identifying inner retinal contributions to the human multifocal ERG.

D C Hood1, V Greenstein, L Frishman

  • 1Department of Psychology, Columbia University, New York, NY 10027, USA. don@psych.columbia.edu

Vision Research
|May 27, 1999
PubMed
Summary

Inner retinal function in multifocal electroretinograms (ERG) was studied using drug injections in monkeys. Similar signals were found in humans, and were diminished in glaucoma and diabetes patients, indicating inner retinal dysfunction.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Retinal Physiology

Background:

  • The multifocal electroretinogram (ERG) assesses retinal function.
  • Distinguishing inner retinal contributions (ganglion and amacrine cells) in human ERGs is challenging.

Purpose of the Study:

  • To identify and characterize inner retinal components in the human multifocal ERG.
  • To investigate the presence of these components in patients with inner retinal diseases like glaucoma and diabetes.

Main Methods:

  • Monkeys received intravitreal injections of n-methyl DL-aspartate (NMDLA) and tetrodotoxin (TTX) to isolate inner retinal contributions to the ERG.
  • Human multifocal ERGs were recorded at 50% and 100% contrast.
  • ERG recordings from patients with glaucoma and diabetes were analyzed.

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Main Results:

  • Drug-induced changes in monkey ERGs helped identify specific inner retinal components.
  • Human multifocal ERGs at 50% contrast revealed components similar to those affected by the drugs in monkeys.
  • These specific inner retinal components were reduced or absent in patients with glaucoma and diabetes.

Conclusions:

  • The study successfully identified specific inner retinal contributions to the human multifocal ERG.
  • Reduced inner retinal components in the ERG of glaucoma and diabetes patients suggest these diseases impact inner retinal function.