Polycarbonate lens. Polycarbonate material was originally developed for aerospace purposes, now it is a standard material used in safety eyewear, sports glasses, and child glasses due to its lightweight and impact-resistant features. It can apply to multiple colors and add the surface coating. Such as hard and anti-fog coating for safety glasses; mirrors and multi-layer coating for sports glasses. It also can do photochromic lenses and PC-Polarized lenses.