Popularly it is claimed that yellow/amber and brown-tinted glasses have been used to alleviate symptoms of syphilis in the 19th and early 20th centuries, because sensitivity to light being one of the symptoms of the disease, although no sources have been found which state prescription of such. By the 19th century tainted spectacles were worn by railway travelers. One of the earliest surviving depictions of a person wearing sunglasses is of the scientist Antoine Lavoisier in 1772 who worked with amplified sunlight. Protection from the Sun's rays was not a concern for him.Īntoine Lavoisier conducting an experiment related to combustion generated by amplified sun light. These were not "sunglasses" as that term is now used Ayscough believed that blue- or green-tinted glass could correct for specific vision impairments. James Ayscough began experimenting with tinted lenses in spectacles in the mid-18th century, around 1752. The Doge and other well-off Venecians such as possibly Goldoni sported in the later 18th century so-called 'goldoni glasses', tainted pairs of spectacles with pieces of cloth as sun guards on the sides of the glasses. īy the 18th century tainted mirror-like framed Murano glasses had been used as so-called 'gondola glasses' ( vetri da gondola and also da dama) by Venician women and children, to shield there eyes from the glare from the water in the canals. King Louis XIV's court watched the 1706 Solar eclipse through a telescope with a smoky glass filter attached. In 1459 Nuno Fernandes made a request for a pair of spectacles to protect the eyes while horseriding in the snow against the glare coming from the snow, though no description of any actual spectacles is given. Documents describe the use of such crystal sunglasses by judges in ancient Chinese courts to conceal their facial expressions while questioning witnesses. The first sunglasses, made from flat panes of smoky quartz called Ai Tai, meaning ‘dark clouds', which offered no corrective powers but did protect the eyes from glare, were used in China in the 12th century or possibly earlier. These, however, appear to have worked rather like mirrors. It is said that the Roman emperor Nero liked to watch gladiator fights using cut emeralds. In many different forms and with many different materials, the indigenous peoples of North America and northern Asia crafted highly efficient equipment to protect their eyes against the damaging effects of strong sunlight in icy circumstances. Since prehistoric times until the spread of contemporary UV-shielding spectacles, Inuit people made and wore Snow goggles of flattened walrus or caribou ivory with narrow slits to look through to block almost all of the harmful reflected rays of the sun. Inuit snow goggles function by reducing exposure to sunlight, not by reducing its intensity It is important to note that dark glasses that do not block UV radiation can be more damaging to the eyes than not wearing eye protection at all, since they tend to open the pupil and allow more UV rays into the eye.
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Their usage is mandatory immediately after some surgical procedures, such as LASIK, and recommended for a certain time period in dusty areas, when leaving the house and in front of a TV screen or computer monitor after LASEK. The American Optometric Association recommends wearing sunglasses that block ultraviolet radiation (UV) whenever a person is in the sunlight to protect the eyes from UV and blue light, which can cause several serious eye problems. Since the 1930s, sunglasses have been a popular fashion accessory, especially on the beach. In the early 20th century, they were also known as sun cheaters ( cheaters then being an American slang term for glasses). They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are colored, polarized or darkened. 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. Wearing sunglasses under direct sunlight: Large lenses offer good protection, but broad temple arms are also needed against "stray light" from the sides.
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