Table of Contents
Definition of Scotoma
An area of the retina in which there are few or no cones or rods, the specialized nervecells that convert light signals to nerve impulses, creating a blind spot in the visual field. Scotomas may represent healed injuries to the retina such as retinal tears or degeneration of the retina such as may occur with age-related macular degeneration (armd) or glaucoma.
A simple test called the amsler grid, a grid of equally spaced vertical and horizontal lines, detects scotomas.
See also RETINOPATHY.
Page last reviewed: