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.

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