Glass lenses are the best optical material, but because ordinary glass lenses are relatively easy to break, they are not safe for people who love outdoor sports, so they are basically not used in sunglasses.
Nowadays, the most commonly used lenses for sunglasses are resin lenses. Resin is a chemical substance with a phenolic structure. It is characterized by being very light, resistant to high temperatures, resistant to impact, and can effectively block ultraviolet rays. It should be said that this is a relatively excellent sunglass lens material. Polarized lenses made of this material will make us see things more clearly.
There is also a kind of sunglass lens called PC lens on the market. This kind of lens has excellent performance in terms of impact resistance and not easy to break. It is a material suitable for making sports sunglasses. It should be said that PC lenses perform better than resin lenses, but of course they are more expensive.
