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Eyewear
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(Buch) |
Dieser Artikel gilt, aufgrund seiner Grösse, beim Versand als 2 Artikel!
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| Source: Wikipedia. Pages: 39. Chapters: Sunglasses, Helmet mounted display, Liquid crystal shutter glasses, Head-mounted display, Monocle, Pince-nez, Polarized 3D glasses, Goggles, Adjustable-focus eyeglasses, Eyepatch, Ray-Ban, Horn-rimmed glasses, AN-6530 goggles, Polaroid Eyewear, Browline glasses, Blindfold, Shutter Shades, GI glasses, Vuzix, Bone spectacles, Swedish goggles, Glasstron, Scissors-glasses, Lorgnette, Inuit snow goggles, Dark adaptor goggles, Cat eye glasses, Police. Excerpt: Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are colored, polarized or darkened. In the early 20th century they were also known as sun cheaters (cheaters being an American slang term for glasses). Many people find direct sunlight too bright for comfort during outdoor activities. Healthcare professionals recommend eye protection whenever the sun comes out to protect the eyes from ultraviolet radiation (UV) and blue light, which can cause several serious eye problems. Sunglasses have long been associated with celebrities and film actors primarily from a desire to mask their identity. Since the 1940s sunglasses have been popular as a fashion accessory, especially on the beach. Inuit snow goggles function by reducing exposure to sunlight, not by reducing its intensityIn prehistoric and historic time, Inuit peoples wore flattened walrus ivory "glasses," looking through narrow slits to block harmful reflected rays of the sun. It is said that the Roman emperor Nero liked to watch gladiator fights with emeralds. These, however, appear to have worked rather like mirrors. Sunglasses made from flat panes of smoky quartz which offered no corrective powers but did protect the eyes from glare were used in China in the 12th century or possibly earlier. Ancient documents describe the use of such crystal sunglasses by judges in ancient Chinese courts to conceal their facial expressions while questioning witnesses. James Ayscough began experimenting with tinted lenses in spectacles in the mid-18th century, around 1752. These were not "sunglasses" as that term is now used; Ayscough believed blue- or green-tinted glass could correct for specific vision impairments. Protection from the Sun's rays was not a concern for him. Yellow/amber and |
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