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Relative afferent pupillary defect (RAPD

An indication of damage to the visual system which is greater on one side than the other. The presence of a relative afferent pupillary defect (RAPD) means that the pupils constrict less when a light is directed into the affected eye than they do when the same light is directed into the normal (or less affected) eye . The presence of an RAPD usually indicates damage to the retina or optic nerve that results in diminished light impulses being transmitted from the eye to the brain on the affected side.

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