A recording of the electrical activity produced by the retina of the eye in response to light stimulation.
From electro- (electricity) + retino- (relating to the retina, from Medieval Latin retina) + -gram (recording, from Greek gramma 'written character'). Developed in the early 20th century.
An electroretinogram can detect eye diseases before you even notice vision problems, because it picks up electrical changes in the retina's light-sensing cells—it's like reading your eye's hidden electrical signals to catch problems early.
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