| photochromic | Of or pertaining to photochromy; produced by photochromy. Source: Websters Dictionary (01 Mar 1998) |
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| photochromic lens | A light-sensitive spectacle lens that reduces light transmission in sunlight and increases transmission in reduced light. (05 Mar 2000) |
| photochromic spectacles | Spectacles with lenses that darken on exposure to ultraviolet light. (05 Mar 2000) |