photochromic lens

Medical Dictionary

photochromic lens pho·to·chro·mic lens (fō'tə-krō'mĭk)
A light-sensitive eyeglass lens that automatically darkens in sunlight and clears in reduced light.

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