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photochromic lens

(fō′tə-krōmĭk)
n.
  1. A light-sensitive eyeglass lens that automatically darkens in sunlight and clears in reduced light.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.