Health is wealthUltra Violet Rays - Sunglasses
The sunglasses are used for protecting our eyes from the evil affects of the sun rays. A special clear coating is applied to the lenses, either on the front or back of the lens, or sometimes both sides. It is a transparent coating and can be applied to any color of lens including clear. The UV-filtering effect, however, is more complex. UV-filtering lenses are coated with special chemicals that allow light to pass through them, but reflect away UV. UV rays are basically a high-frequency light waves which means that the chemical structure has to be built to deflect higher frequency light while allowing through lower frequency light. The most complicated sunglasses are prescription sunglasses. These are sunglasses that not only protect from light and UV, but also work like normal glasses to correct the eyesight. For this to work, it requires that normal vision-correction glasses are taken, tinted and coated with UV-reflecting chemicals.
