Transitions Gen 8: The Best Photochromic Lenses – Vision Express
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Transition Lenses vs. Sunglasses | Blog | Eyebuydirect
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EO-Executive Optical - “Photochromic lenses or transition lenses are eyeglass lenses that darken automatically when exposed to sunlight, then fade back when you return indoors.” Source: http://www.allaboutvision.com/ lenses/photochromic.htm | Facebook