Tonic pupil

Medical Dictionary

tonic pupil n.
A usually enlarged pupil that responds very slowly to changes in focal length and exposure to light. Also called Piltz sign, Westphal-Piltz pupil.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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