A UV filter is a type of camera filter that blocks ultraviolet (UV) light from entering the lens. It is primarily used to protect the lens from scratches, dust, and moisture while also reducing the haze that can occur in outdoor photography. UV filters are often clear and do not affect the colors or exposure of the image. In addition to photography, UV filters are also commonly found in sunglasses and other eyewear to protect the eyes from harmful UV radiation from the sun. Prolonged exposure to UV rays can lead to eye damage, making these filters an important feature for outdoor activities.