What Is The Difference Between Optical Lenses And Ordinary Lenses?

As an scientific optical lens, the biggest advantage of crystal is that it is hard and the lens produced is not easy to wear. It was popular in the 2030s of this century. Because of the durability of the lenses they make, they are often passed on to the next generation because of their high price. In the folk: "crystal care". The main component of crystal is SiO2, a natural transparent mineral. The absorption rate of ultraviolet light by aspherical lens is only 14.5%, and the absorption rate of ultraviolet light by glass is 52%. At present, the absorption rate of ultraviolet light by resin lens added with UV material has reached more than 90%. Ultraviolet damage to the human eye is well known. Ultraviolet light is the causative agent of senile cataract, and damage to the cornea and retina is also positive. It is reported that the damage caused by ultraviolet rays to the eyes is cumulative, so the prevention of ultraviolet rays is important for everyone at every time. In addition, natural crystals often contain impurities, and the density is not uniform, and bubbles and streaks may occur to cause birefringence, thereby affecting vision. It can be seen that crystal not only has no eye-catching effect, but its high transmittance to ultraviolet rays is harmful to the eyes. Today, with the rapid development of science and technology, the new optical material like plano concave lens is far superior to crystal regardless of its optical performance, safety performance and protection against harmful rays.