glossary

A test that measures the electrical activity of the retina when exposed to flashes of light of varying intensity. Abnormalities in the electroretinogram typically occur in conditions that affect the photoreceptor cells (e.g. retinitis pigmentosa).

Clear and comfortable eyesight in both far and near vision. Emmetropia is the opposite of ametropia. Absence of Refractive Error. Sometimes called ?Normal 20/20 Vision.? Images at 20 feet focus sharply on the retina.

Infection which involves the internal structures of the eye. It usually poses a serious threat to the visual function of the eye.