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sunglasses (dict)

Sunglasses

Sunglasses (also called sun spectacles – see usage of words for eyepieces) are a kind of visual correction aid, variously termed spectacles or glasses, which feature lenses that are coloured or darkened to screen out strong light from the eyes. Many people find direct sunlight too bright to be comfortable, especially when reading from paper on which the sun directly shines. In outdoors activities like skiing and flying, the eye can receive more light than usual. Also, with the rise of the atmosphere's damaged ozone layer, it has been recommended to the public to wear these kind of glasses on sunny days to protect the eyes from ultraviolet radiation, which can lead to the development of a cataract. Sunglasses have also been associated with film actors since the lighting involved in production is typically strong and uncomfortable to the naked eye. Also hiding one's eyes has implications in face-to-face communication: It can hide weeping, being one of the signs of mourning, it can be intimidating as in the stereotype of the guardian of a chain gang, or can show detachedness considered cool in some circles. Also darkened sunglasses of particular shapes can get in vogue as an accessory. Note that, in the Western world, normal glasses are very rarely worn without a practical purpose. Curiously they can project an image of uncool nerdiness that sunglasses don't have. This secondary uses can justify wearing sunglasses by night or indoors. It is important that the makers of one's sunglasses ensure that the glasses protect against UV (ultraviolet) rays. Lenses that are simply dark but do not provide UV protection may actually make things worse, as the dimmer light causes the pupils to dilate, admitting more UV rays. In the European Union, a CE mark(20px) identifies glasses fulfilling quality regulations. In the preparation for sun eclipses, health authorities often warn against looking to the sun with sunglasses. The color of the tint can vary with fashion, but for general use, grey or brown is recommended to avoid color distortion, that could be dangerous when, for instance, driving a car. Some models use a degradation where the top of the glass (through which the sky is looked at) is very tinted and the bottom (the darker ground) is transparent. Mirrorshades have a semireflecting coating that makes them look like a mirror. Shooters often wear yellow glasses to protect their eyes from particles. With the introduction of office computing, ergonomists can recommend mildly tinted glasses for display operators to increase contrast. Corrective lenses can be darkened to serve the same purpose, or secondary clip-on dark lenses can be placed in front of the regular lenses. Some lenses made with organic glass gradually darken with bright light and lighten in darkness. People with severe visual impairment, such as the blind, often wear sunglasses so they do not make others uncomfortable with the fact that they cannot make eye contact with them (not seeing eyes may be better than seeing eyes which seem to look in the wrong direction), or to hide the eyes if their appearance is abnormal, for example due to cataracts. Before the introduction of sunglasses, one-eyed people could wear an eyepatch to not disturb other people. Some people who are severely visually impaired but still sighted wear sunglasses in order to protect their vision against glare.

History

It is said that the Roman emperor Nero liked to watch gladiator fights through polished gems to recreate with the color and image distortion. Sunglasses were first used in China in the 12th century or possibly earlier. The "lenses" of these glasses were flat panes of smoky quartz, which offered no corrective powers but did protect the eyes from glare, and, according to some sources, evil spirits. Contemporary documents describe the use of such glasses by judges in Chinese courts to conceal their facial expressions while questioning witnesses. Compare the representation of "blind Justice" in Western art. James Ayscough began experimenting with tinted lenses in spectacles in the mid-18th century. These were not "sunglasses" as such; Ayscough believed blue- or green-tinted glass could correct for specific vision impairments. Protection from the sun's rays was not a concern of his. Sunglasses as such were introduced by Sam Foster in 1929. Foster found a ready market on the beaches of Atlantic City, New Jersey, where he began selling Foster Grants from a Woolworth on the Boardwalk. Sunglasses would not become polarized, however, until 1936, when Edwin H. Land began experimenting with making lenses with his patented Polaroid filter. In 2004 Oakley (fashion) has developed Thump, sunglasses with built-in digital audio player.

People predominantly seen wearing sunglasses

Some celebrities are predominantly seen in public wearing sunglasses. These people include: The reasons for this are varied and the behavior is typically the source of much speculation in the yellow press.

Fictional characters predominantly seen wearing sunglasses

Some fictional characters are predominantly depicted as wearing sunglasses. These include:

 

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