What is Scotoma definition
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.