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Glass lenses use visible light to darken. They are principally used in glasses that are dark in bright sunlight, but clear, or more rarely, lightly tinted in low ambient light conditions. They darken significantly within about a minute of exposure to bright light and take somewhat longer to clear. A range of clear and dark transmittances is ...
Cartier International SNC, or simply Cartier (/ ˈ k ɑːr t i eɪ / KAR-tee-air, French:), is a French luxury-goods conglomerate that designs, manufactures, distributes, and sells jewelry, watches, leather goods, sunglasses and eyeglasses.
Sunglasses or sun glasses (informally called shades or sunnies; more names below) are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes.
The AN6531 Comfort Cable aviator sunglasses frame kept being issued by the U.S. military as No. MIL-G-6250 glasses after World War II with different lenses as Type F-2 (arctic) and Type G-2 aviator sunglasses but fitted with darker lenses until their substitute, the Type HGU-4/P aviator sunglasses, became available in the late 1950s. [14] [15] [16]
Opalescent glass. The term "opalescent glass" is commonly used to describe glass where more than one color is present, being fused during the manufacture, as against flashed glass in which two colors may be laminated, or silver stained glass where a solution of silver nitrate is superficially applied, turning red glass to orange and blue glass to green.
Using chicken eyeglasses was still practiced in 1973, evidenced by Illinois' The Hawk-Eye newspaper that a farmer had 8,000 chickens fitted with the rose-colored variety. [20] One inventor of a form of the glasses proposed legislation in Kansas to require all chickens in the state to be fitted with glasses, but his campaign was unsuccessful. [21]