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Sunglasses that meet this requirement are often labeled as "UV400". This is slightly more protection than the widely used standard of the European Union (see below which requires that 95 of the radiation up to only 380 nm must be reflected or filtered out. 17 Sunglasses.
To protect against "stray light" from the sides, the lenses should fit close enough to the temples and/or merge into broad temple arms or leather blinders. Polaroid Sunglasses It is not possible to "see" the protection that sunglasses offer. Dark lenses do not automatically filter.
This type of eyewear can filter out UV radiation harmful to the eyes. 18 More recently, high-energy visible light (HEV) has been implicated as a cause of age-related macular degeneration; 19 before, debates had already existed as to whether "blue blocking" or amber tinted lenses.
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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 then being an American slang term for.
Inexpensive mass-produced sunglasses made from celluloid were first produced by Sam Foster in 1929. Foster found a ready market on the beaches of Atlantic City, New Jersey, where he began selling sunglasses under the name Foster Grant from a Woolworth on the Boardwalk. 11 By.
Several standards for sunglasses (see below ) allow a general classification of the UV protection (but not the blue light protection and manufacturers often indicate simply that the sunglasses meet the requirements of a specific standard rather than publish the exact figures. The only "visible".
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