What kind of lens can't make sunglasses

 Do you know the crystal of eyeglasses? This kind of lens can't make Sunglasses Seattle. You know why? Let me tell you a little trade secret. All say crystal piece is best, absorb heat, Progressive Sunglasses Online comfortable. Actually a bit ultraviolet ray is not absorbed, do not have a bit benefit to glasses, of natural crystal return abnormal condition expensive! Here is another secret, in fact, Inexpensive Polarized Sunglasses uv protection function is not mainly by coating coating, diaphragm and other things. Do not believe yourself to measure measure, take a glass piece casually in front of sunshine, come out to prevent ultraviolet ray ability to 90%, say UV400 Cheap Designer Sunglasses Womens so 100% prevent ultraviolet ray is good to hear stop, actually prevent ultraviolet ray the biggest effect is lens itself.