glossary

A technique of recording electrical impulses from the contraction of a muscle. It is used to confirm the correct position of the needle when botulinum toxin is used to correct strabismus.

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.