electroretinography

Electroretinography (ERG) is a diagnostic test that measures the electrical activity of the retina, the light-sensitive layer at the back of the eye. During the test, electrodes are placed on the surface of the eye to detect responses when light flashes are presented. This helps assess the health of retinal cells, particularly photoreceptors, which are crucial for vision. ERG is commonly used to diagnose conditions like retinal degenerations, optic nerve issues, and other visual impairments, aiding in understanding the underlying causes of vision problems.