Ultraviolet A and ultraviolet B rays are both harmful to the eyes of human beings, therefore, it is very important for people to wear sunglasses in a sunny when they are in the open. Generally speaking, the normal sunglasses are often ultraviolet rays proofed, and you can choose a pair of quality sunglasses
with one hundred percent UV-proofed, that is, the UV400 sunglasses. The best lenses for sunglasses are the polarized lens, and the best color for sunglasses are dark brown and deep green. And there is another thing you should pay special attention to, that is, the luminance of the environment. For example, if the luminance is dim and dark, wearing sunglasses will on the contrary do harm to your eyes. In general, in the standard glasses
shop there will be specialized instrument for you to detect the capacity of the sunglasses to screen the ultraviolet. Therefore, you had better go to a standard glass shop to choose one pair. You can also refer to the following website for further information about the sunglasses.