Photochromatic Glass Lenses

As the naturally occurring chemical composition Silver Halide Crystal, Photochromatic lenses are synthetic Silver Halide. Basically, Photochromatic lenses have the ability to darken when exposed to Ultraviolet light. Also known as "light-adaptive" or "variable tint", Photochromatic lenses are a glass lens that maintain a consistent tint regardless of the environs but when exposed to ultraviolet light, the molecular structure of the synthetic silver halide responds naturally by darkening.