Photochromic lenses, also known as "self-tinting," are lenses that automatically change their tint according to the intensity of ambient light. Their primary function is to react to ultraviolet (UV) radiation. Indoors or in low light, the lenses remain clear, allowing for unobstructed vision. However, once exposed to sunlight, the molecules in the lens are activated and the lens darkens, transforming into sunglasses. For smart glasses, this technology means that the user does not have to switch between two pairs of glasses – one for indoor and another for outdoor use. A single device thus combines the function of standard glasses with sunglasses while simultaneously providing protection against UV radiation. This adaptability ensures comfortable viewing of information on the smart glasses' display under any lighting conditions, whether you are in the office or in direct sunlight.