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Wernicke's reaction

n.
  1. A reaction seen in hemianopsia in which the pupil constricts when light is directed to the normal side of the retina, but fails to constrict when light is directed to the retina's blind side.hemiopic pupillary reaction Wernicke's sign
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.