PC lens, also known as space film, chemical name is polycarbonate, it is tough and not easy to break,

can effectively prevent lens fragmentation during intense exercise. At the same time, PC lens is light

in weight, with a specific gravity of only 2 grams per cubic centimeter, and has good properties.

However, due to high price, troublesome processing and insufficient dispersion control,

PC lenses are only sold in a small amount on the market.