May 26, 2019

Wearing sunglasses is not only to block the sun but to become a fashion lady has already used sunglasses as a must-have item like a necklace and earrings to modify their looks; Men use sunglasses as a highlight of their masculine charm. And in recent years, more and more people talk about sunglasses and mention […]

Understand UV   The ultraviolet rays in sunlight are classified into short-wave ultraviolet (UVC) (100 to 280 nm), medium-wave ultraviolet (UVB) (280 to 320 nm), and long-wave ultraviolet (UVA) (320 to 400 nm), in which UVC passes through the atmospheric ozone layer blocked. Only UVA and UVB can reach the surface of the earth. UVA