photochromic glass


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photochromic glass

Glass that is manufactured to appear clear until light strikes it. When used in sunglasses, the lens becomes dark and reduces the amount of light transmitted, becoming clear again when no longer exposed to bright light.
See also: glass
References in periodicals archive ?
10 Photochromic glass darkens according to light intensity; electrochromic glass changes in relationship to an electric current passed across it.
Stookey, retired research fellow of Corning Incorporated, was presented with the National Medal of Technology from President Ronald Reagan for his invention of glass-ceramics, photosensitive glass and photochromic glass.