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An inability to perceive depth on the basis of binocular disparity, owing to a reduction in the number of functioning disparity-selective cells in the visual cortex, usually as a result of strabismus during infancy. The condition is believed to be quite common (perhaps 4 or 5 per cent of the population) but is generally unrecognized because other depth cues compensate, though it is immediately apparent under examination with stereograms or anaglyphs. See also depth perception.

Subjects: Psychology.

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