Topic: diagnostic test

What is an Electroretinogram? An electroretinogram (ERG) is a diagnostic test that is used to assess the overall function of the retina. The retina is the light-sensitive layer of tissue at the back of the eye. During an ERG test, small contact lens electrodes are placed on the surface of the eye to detect the electric potential created by retinal cells in response to light stimuli. The electroretinogram reflects retinal function by measuring the summed electrical activity of different retina...

The Basics of Electroretinogram Testing An electroretinogram (ERG) is a diagnostic test that measures the electrical activity of the retina in response to a light stimulus. The retina contains two types of photoreceptor cells - rods and cones. Rods are responsible for peripheral and night vision while cones provide color vision and detail. ERG testing helps ophthalmologists evaluate the function of both rods and cones to detect retinal abnormalities. During an ERG exam, electrodes are plac...