eye disorders
Tests for Eye Disorders
Electroretinography
Electroretinography allows a doctor to examine the function of the light-sensing cells (photoreceptors) in the retina by measuring the response of the retina to flashes of light. Eye drops numb the eye and dilate the pupil. A recording electrode in the form of a contact lens is then placed on the cornea, and another electrode is placed on the skin of the face nearby. The eyes are then propped open. The room is darkened, and the person stares at a flashing light. The electrical activity generated by the retina in response to the flashes of light is recorded by the electrodes. Electroretinography is particularly useful for evaluating diseases, such as Retinitis Pigmentosa , in which the photoreceptors are affected. 