Photochromic lenses change color in the sunlight. Typically, they are clear indoors and at night and change to grey or brown when exposed to direct sunlight. There are other specific types of photochromic lenses that never turn clear.
Blue cut lens is lens that prevents blue light from irritating the eyes. Special anti-blue light glasses can effectively isolate ultraviolet and radiation and can filter blue light, suitable for watching computer or TV mobile phone use.
Tags: Blue blocker lenses, Anti-blue ray lenses, Blue cut glasses, photochromic lens