A photochromic lens is a lens that becomes dark when exposed to a certain wavelength of light (usually ultraviolet light). When it is no longer illuminated by this light source, the original light transmittance will be restored and become clear. Photochromic lenses can be made of glass or plastics including polycarbonate. The discoloration effect is caused by the silver chloride or other halides added in the lens. Such substances are transparent to visible light when they are not irradiated by ultraviolet light. When they are irradiated by ultraviolet light, they will react chemically. It will absorb part of the visible light and make the lens look darker. This chemical reaction is a reversible reaction, so the lens will return to its original transparent state when it is no longer irradiated by ultraviolet light. Let's follow the editor of Single Vision Photochromic Darker lens to learn more about it!

1. The color-changing lens is also called "photosensitive lens". The glass lens is made of silver halide, but the current mainstream is the resin color lens. The acrylic resin lens is added with pyrirole ring and other chemicals, so that the originally transparent and colorless lens will become a colored lens when exposed to strong light. , For protection, so it is suitable for indoor and outdoor use at the same time.
2. The color-changing lens is made of optical glass containing silver halide microcrystals. According to the principle of the reversible reaction between light and color, it can be quickly darkened under sunlight and ultraviolet rays, completely absorb ultraviolet rays, and neutrally absorb visible light; back to dark It can quickly restore colorless and transparent.
3. The color-changing lens is mainly used in open-air, snowy, and indoor workplaces with strong light sources to prevent damage to the eyes from sunlight, ultraviolet light, and glare.
The above is the story of the editor of Single Vision Photochromic Darker lens: the relevant knowledge of the color changing lens.