Did you know: Sunglasses were first used by judges in Chinese courts to conceal their facial expressions while questioning witnesses?! While they serve a significantly different purpose today, sunglasses have become an important part of eye protection. Here's why:

Light is broken into three different types: UVA, UVB, and UVC. UVA has longer wavelengths and passes through glass easily. UVB rays are the most dangerous, as they don't go through glass. These types of rays make sunglasses a must. UVC rays don't reach the earth because of atmospheric blockage.
Utilizing polarized and anti-reflective sunglasses greatly reduces severe glare. Light that is reflected from surfaces like a flat road or smooth water is generally horizontally polarized. The horizontally polarized light from these surfaces is blocked by the vertically oriented polarizers in the lenses of these types of sunglasses. Anti-reflecting coatings reduce glare that comes from light reflection off the back surface of the sunglass lenses. Both of these types are of great benefit when doing activities on water, snow, or driving.
History of the Style
Cheap sunglasses (not the ZZ Top song!) were first manufactured in 1929 by an American man named Sam Foster, whose primary purchasers were beach goers in New Jersey. This was the defining time of sunglasses as a fashion accessory. Polarized lenses crept into the scene in 1936 from developer Edwin Land, who patented the Polaroid filter.
Ever increasing styles, materials, and varieties of sunglasses are being made everyday. Remember: eye damage is cumulative, meaning it increases from year to year, so the sooner you protect your eyes, the better.
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