Photochromic technology refers to materials that change color or transparency in response to light exposure. This technology is commonly used in eyeglasses that darken when exposed to sunlight, providing protection from harmful UV rays. The process involves special molecules that react to light, allowing the lenses to adapt to different lighting conditions. This technology is also found in various applications, including windows that tint automatically and sunglasses that adjust to brightness. Photochromic materials enhance comfort and visibility, making them popular in everyday products. Their ability to respond to environmental changes offers convenience and improved eye protection.