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Recording multifocal electroretinogram on and off responses in humans
M Kondo1, Y Miyake, M Horiguchi
1Department of Ophthalmology, Nagoya University School of Medicine, Japan.
Investigative Ophthalmology & Visual Science
|March 21, 1998
Summary
The human retina
Area of Science:
- Ophthalmology
- Neuroscience
- Physiology
Background:
- The human retina's visual processing capabilities are influenced by the spatial distribution of its components.
- Understanding the electroretinogram (ERG) is crucial for assessing retinal function.
Purpose of the Study:
- To record on and off responses of the multifocal photopic electroretinogram (ERG) in the human retina.
- To investigate how ERG components (a-, b-, and d-waves) vary with retinal eccentricity.
Main Methods:
- Multifocal ERGs were recorded using a visual evoked response imaging system.
- Stimuli were modulated using a binary m-sequence under constant background illumination.
- Response densities were calculated for different retinal eccentric rings in five normal subjects.
Main Results:
- Response densities for a-, b-, and d-waves decreased with increasing retinal eccentricity.
- The d-wave to b-wave amplitude ratio was lowest centrally and increased peripherally.
- The a-wave to b-wave amplitude ratio also increased towards the periphery.
Conclusions:
- Human cone ERG on and off responses exhibit distinct spatial distributions.
- Photopic retinal circuitry appears to change with increasing retinal eccentricity.