About Sunglasses – Gkboptical

1. About Sunglasses – Gkboptical.com Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. In the early 20th century they were also known as sun cheaters

2. History of Sunglasses In prehistoric and historic time, Inuit people wore flattened walrus ivory "glasses," that came with narrow slits that block harmful rays of the sun . First Sunglass in History Which Protect the eyes from Snow…. Inuit snow goggles function by reducing exposure to sunlight, not by reducing its intensity

3. Modern developments In the early 1900s, the use of sunglasses started to become more widespread, especially among movie stars. It is commonly believed that this was to avoid recognition by fans, but an alternative reason sometimes given is that they often had red eyes from the powerful arc lamps that were needed due to the extremely slow speed film stocks used 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

4. Functions of Sunglasses Visual clarity and comfort Sunglasses can improve visual comfort and visual clarity by protecting the eye from glare. Various types of disposable sunglasses are dispensed to patients after receiving mydriatic eye drops during eye examinations. The lenses of polarized sunglasses reduce glare reflected at some angles off shiny non-metallic surfaces such as water. They are popular among fishermen because they allow wearers to see into water when normally only glare would be seen. The glare is neutralized by blocking the vertical (magnetic) components of light.

5. Functions of Sunglasses Protection of Eyes from many Factors Sunglasses offer protection against excessive exposure to light, including its visible and invisible components. The most widespread protection is against ultraviolet radiation, which can cause short-term and long-term ocular problems High-energy visible light (HEV) has been implicated as a cause of age-related macular degeneration. before, debates had already existed as to whether "blue blocking" or amber tinted lenses may have a protective effect. Sunglasses are especially important for children, as their ocular lenses are thought to transmit far more HEV light than adults

6. Functions of Sunglasses Assessing the protection of sunglasses The only way to assess the protection of sunglasses is to have the lenses measured, either by the manufacturer or by a properly equipped optician . Several standards for sunglasses allow a general classification of the UV protection . Manufacturers often indicate simply that the sunglasses meet the requirements of a specific standard rather than publish the exact figures .

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