Sunglasses

• Sunglasses - Sport Sunglasses -

Globe Pens for promotional use. Ballpoint pen with a golbe on the top.

Fútbol plumas para uso promocional. Bolígrafo con un balón pequeño en la parte superior.

Football Pens for promotional use. Ballpoint pen with a small football on top.

The UV Index developed by the U.S. Environmental Protection Agency (EPA) and the National Weather Service (NWS) has made many Americans more aware of the risks of sunburn and skin cancer from the sun's ultraviolet (UV) radiation.

But did you know UV and other radiation from the sun also can harm your eyes?

Extended exposure to the sun's UV rays has been linked to eye damage, including cataracts, macular degeneration, pingueculae and pterygia and photokeratitis that can cause temporary vision loss.

Precursors

It is said that the Roman emperor Nero liked to watch gladiator fights with emeralds. These, however, appear to have worked rather like mirrors.[2] Flat panes of smoky quartz which offered no corrective powers but did protect the eyes from glare were used in China in the 12th century or possibly earlier. Contemporary documents describe the use of such crystals by judges in Chinese courts to conceal their facial expressions while questioning witnesses.[3]

Sunglasses or sun glasses are forms of protective eyewear that usually enclose or protect the eye area in order to prevent strong light from reaching the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist which feature lenses that are coloured, polarized or darkened. In the early 20th century they were also known as sun cheaters (cheaters being an American slang term for glasses).[1]

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