1.56 Progressive Photochromic UV420 Blue Cut Optical HMC Lens

Progressive lens provide a great solution for people who want to escape the limited correction that most lenses provide. As their name suggests, progressive lens provides clear vision not just for nea and far, but also for all distance in between without any abrupt changes or visible lines in the lens.

Lenses photochromic are popular of all-purpose, indoor & outdoor day to day activities. Photochromic lenses are Light-adaptive and can be placed in just about any fashion frame. Photochromic lenses are faster darkening in about one minute, yet they clear indoors immediately in comparison to ordinary plastic.

The difference between anti-blue lens and ordinary lens: anti-blue lens and ordinary lens are yellow-green film, but ordinary lens has a yellow feeling under the reflection of light; The anti-blue lens is light blue in the light and can reflect the blue light.

Blue light is divided into beneficial and harmful. Blue light with a wavelength between 415 and 455 nm is short-wave harmful blue light, which needs to be protected. According to the principle of complementary color of light, blue and yellow are complementary colors, so glasses with blue light protection function will be slightly yellow compared with ordinary lenses. The higher the blocking rate of harmful blue light, the darker the background color of anti-blue light glasses.