electroretinogram
Quick Summary
An electroretinogram (ERG) is a medical test that records the electrical activity of the retina in response to light. It involves placing an electrode on the cornea and another on the body, then illuminating the retina. The resulting electrical changes are recorded as a graph. This test helps analyze retinal mechanisms and can be used to objectively measure the eye's response to light, aiding in the diagnosis of retinal conditions. The ERG can reveal electrical changes occurring at different levels of the retina, including the photoreceptor cells, horizontal cells, and ganglion cells.123
Ask Britannica AI about this topic
Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.
human eyeBleaching of rhodopsinThus, the electroretinogram (ERG) is the record of changes in potential between an electrode placed on the surface of the cornea and an electrode placed on another part of the body, caused by illumination of the eye.
Read MoreThus, the electroretinogram (ERG) is the record of changes in potential between an electrode placed on the surface of the cornea and an electrode placed on another part of the body, caused by illumination of the eye.
Read More- human eyeThe electroretinogram
If an electrode is placed on the cornea and another, indifferent electrode is placed, for example, in the mouth, illumination of the retina is followed by a succession of electrical changes; the record of these is the electroretinogram, or ERG. Modern analysis has shown…
Read MoreIf an electrode is placed on the cornea and another, indifferent electrode is placed, for example, in the mouth, illumination of the retina is followed by a succession of electrical changes; the record of these is the electroretinogram, or ERG. Modern analysis has shown…
Read More