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Many people find direct sunlight too bright to be comfortable, especially when reading from paper on which the sun directly shines. 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.
It is important to ensure that the makers of one's sunglasses ensure that the glasses protect against UV 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.
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.
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. Some people who are severely visually impaired but still sighted wear sunglasses in order to protect their vision against glare.
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 courtThis article is about courts of law . For alternative meanings see: Court (disambiguation). A court is an official, public forum which a public power establishes by lawful authority to adjudicate disputes, and to dispense civil, labour, administrative ands to conceal their facial expressions while questioning witnesses.
James Ayscough began experimenting with tinted lenses in spectacles in the mid- 18th century17th century 18th century 19th century more centuries) As a means of recording the passage of time, the 18th century refers to the century that lasted from 1701- 1800; however, historians will sometimes specifically refer to the 18th Century as 1715- 89,. 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 1929Centuries: 19th century 20th century 21st century Decades: 1870s 1880s 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s Years: 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 See also 1929 in aviation 1929 in film 1929 in literature 1929 in mu. Foster found a ready market on the beachA beach or strand is a geological formation consisting of loose rock particles such as sand, shingle, or cobble along the shoreline of a body of water. Components Some geologists consider a beach to be just this shoreline feature of deposited material, bues of Atlantic City, New JerseyAlternate meanings: See Atlantic City (disambiguation Atlantic City is a city located in Atlantic County, New Jersey, USA. As of the 2000 census, the city had a total population of 40,517. It is a resort community located on Absecon Island, just off the c, where he began selling Foster Grants from a Woolworth on the Boardwalk .
Sunglasses would not become polarized, however, until 1936Events January-February January 15 The first building to be completely covered in glass is completed in Toledo, Ohio, for the Owens-Illinois Glass Company. January 20 Death of George V of the United Kingdom. His son Edward VIII succeedes him as King of th, 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 MP3 player.