Scotoma - definition

Scotoma - definition

Scotoma - an area of the RETINA in which there are few or no cones or rods, the specialized NERVE cells 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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