The principle of color changing lenses mainly relies on a special chemical reaction of ultraviolet light. Silver halides and copper oxide, which contain color changing factors in the lenses, undergo a chemical process under light conditions, causing their shapes to change and decomposing into tiny grains of silver and halides. The new molecular structure will absorb some visible light, causing the color of the lenses to change from light to dark. When in a dimly lit environment, reorganizing these molecules quickly restores their original structure. Silver and halogens are catalyzed by copper oxide to regenerate silver halides, thereby losing the characteristic of absorbing light. As a result, the color of the lens changes from dark to light. We've developed a new item- Photochromic polarized lens. More fashionable, suitable for sports and outside.