comfort and protection sunglasses

Early Chinese piece of flat quartz keep the glare of the sun, in their eyes. Beryl, quartz and crystal is used on some early in the material, keep the bright sunshine bright eyes. In the period, even they use this material to hide facial expressions. Colored lenses from experiment, the middle of 1700. In prehistoric times, seam type of glass is used to help keep the sun's rays entering the eye. Today, the sunglasses to protect his eyes from harmful UV rays.
Star wearing sunglasses, to avoid being recognized by the people, and keep the eyes to protect their populations. When Jacqueline Kennedy began to wear around the 60's sunglasses, wrapped around quickly become many Americans trend. The gambler dark glasses, so that the opponent can not see their eyes or expression. Alcohol or drug people trying to hide their eyes look can reveal their current status.
People wear today provide better resolution, comfort and protection sunglasses. Many people were wearing prescription sunglasses, more expensive. Other wearing sunglasses, cheaper, for their prescription glasses. Sunglasses can help eliminate the glare of the sun and water, glass, metal and other objects reflect headache.
The biggest advantage of sunglasses is the protection of ultraviolet radiation. Ultraviolet radiation can cause many harmful eye disease, and may lead to short-term and long-term problems. Some problems caused by UV irradiation is cancer, cataracts, macular degeneration, snow blindness, keratitis and other eye problems. Standard sunglasses, prevent sun marker. All sunglasses are not the same, did not give the same protection. It is important, in the protection of selecting sunglasses, you'll find out a pair of markers in the ultraviolet 400. These sunglasses can filter out 99-100% UVA. Make sure they fit snugly around the nose and the temple, to eliminate as much as possible of the sun.