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vision
(vizh´әn)
the faculty of seeing; its basic components are the eye itself, the visual areas in the brain, and the optic nerve that connects the two. The eye works like a camera; rays of light enter it through the adjustable iris and are focused by the lens onto the retina, a thin light-sensitive layer that corresponds to the film of the camera. The retina converts the light rays into nerve impulses, which are relayed to the visual areas of the brain, where the brain interprets them as images. Called also sight. adj., vis´ual., adj.
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