The difference between optical glasses and general glasses?
Optical lenses are different from ordinary glass lenses because some materials are added to make them white and increase light transmittance. Generally refers to the optical lens without film for optical lens, and the optical lens with film is called film lens. General sunglasses are made of ordinary glass or ordinary resin, dyed, or added film, infrared and ultraviolet resistant, high-grade sunglasses are made of optical lenses or tempered glass or polarized lens processing, UV protection effect is better.