what is photochromic lens? - Buy Cheap Glasses Online, Prescription Glasses Frames Expert

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09-21-2010, 10:05 PM

Neil Eyeglasses Neil Eyeglasses is offline

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what is photochromic lens?

Photochromic lenses are lenses that darken on exposure to ultraviolet (UV) radiation. Once the UV is removed (for example by walking indoors), the lenses will gradually return to their clear state. Photochromic lenses may be made of glass, polycarbonate, or another plastic.

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