Electroretinography
Electroretinography (pronunciation: e-lek-tro-ret-i-nog-raphy) is a diagnostic test that measures the electrical responses of various cell types within the eye, including the photoreceptors (rods and cones), inner retinal cells (bipolar and amacrine cells), and the ganglion cells. This test is used to detect functional abnormalities within the eye.
Etymology
The term "Electroretinography" is derived from the Greek words "electron" meaning amber, "retina" which is the innermost, light-sensitive layer of tissue of the eye, and "graphy" meaning to write.
Procedure
During an Electroretinogram (ERG), electrodes are placed on the cornea and the skin near the eye. Light stimuli are then flashed into the eye and the electrical response is measured. The patient's responses are compared to normal values to determine if the retinal function is normal or abnormal.
Types of Electroretinography
There are several types of ERGs including full-field (ffERG), multifocal (mfERG), and pattern (PERG). The full-field ERG tests the retina's general response to light, the multifocal ERG tests different areas of the retina, and the pattern ERG tests the macula.
Related Terms
- Electrode
- Cornea
- Photoreceptor Cells
- Retina
- Amacrine Cells
- Ganglion Cells
- Full-field Electroretinography (ffERG)
- Multifocal Electroretinography (mfERG)
- Pattern Electroretinography (PERG)
External links
- Medical encyclopedia article on Electroretinography
- Wikipedia's article - Electroretinography
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