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In prehistoric and historic time, Inuit peoples wore flattened walrus ivory “glasses”, looking through narrow slits to block harmful reflected rays of the sun. These, however, appear to have worked rather like mirrors. 12th century or possibly earlier. Ayscough believed that blue- or green-tinted glass could correct for specific vision impairments. Protection from the Sun’s rays was not a concern for him.
20th centuries because sensitivity to light was one of the symptoms of the disease. American wearers needed them to protect their eyes. 120 million pairs each year. The lenses of polarized sunglasses reduce glare reflected at some angles off shiny non-metallic surfaces, such as water. They allow wearers to see into water when only surface glare would otherwise be seen, and eliminate glare from a road surface when driving into the sun. Sunglasses offer protection against excessive exposure to light, including its visible and invisible components. Sunglasses that meet this requirement are often labeled as “UV400”.
380 nm must be reflected or filtered out. This type of eyewear can filter out UV radiation harmful to the eyes. The only “visible” quality test for sunglasses is their fit. It is not possible to “see” the protection that sunglasses offer. Dark lenses do not automatically filter out more harmful UV radiation and blue light than light lenses. As a result, more unfiltered radiation enters the eye. Depending on the manufacturing technology, sufficiently protective lenses can block much or little light, resulting in dark or light lenses.