Introduction

The main raw material of glass lens is optical glass. The transmittance and mechanical and chemical properties of glass lens are relatively good, with constant refractive index and stable physical and chemical properties.

Color-changing lenses are exposed to ultraviolet and short-wave visible light in the sun, which darkens the color and reduces the light transmittance; In the room or dark, the light transmittance of the lens is improved, and the color fades. The photochromism of lens is automatic and reversible. Color-changing glasses can adjust the light transmittance through lens color change, make the human eye adapt to the change of ambient light, reduce visual fatigue, and protect the eyes. There are two kinds of color change lenses before color change: non-primary color lens and light-color primary color lens; The color after discoloration mainly includes gray and brown.