(of chemically treated glass or plastic) capable of darkening or changing color when exposed to light.

1950–55; photo- + chrom- + -ic

photochromism, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photochromic (ˌfəʊtəʊˈkrəʊmɪk)
(of glass) changing colour with the intensity of incident light, used, for example, in sunglasses that darken as the sunlight becomes brighter

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Add to that incredibly durable photochromic lenses that adapt to any lighting condition, and you have shades for every occasion.
Photochromic lenses will not be used for industrial safety lenses.
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