Transition lenses are special eyeglass lenses that automatically adjust their tint based on the surrounding light conditions. When exposed to sunlight, these lenses darken to reduce glare and protect the eyes from harmful UV rays. In low-light environments, they return to a clear state, allowing for comfortable vision indoors. These lenses are made from photochromic materials that react to UV light. They are popular among people who frequently move between indoor and outdoor settings, as they eliminate the need for separate prescription sunglasses. Transition lenses provide convenience and protection for everyday eyewear users.