Sunglass lenses are specially designed to protect the eyes from harmful ultraviolet (UV) rays emitted by the sun. They come in various tints and colors, which can enhance vision and reduce glare. Common materials for these lenses include polycarbonate, glass, and plastic, each offering different levels of durability and optical clarity. There are several types of sunglass lenses, including polarized, photochromic, and mirrored lenses. Polarized lenses reduce glare from reflective surfaces like water or roads, while photochromic lenses darken in sunlight and lighten indoors. Mirrored lenses have a reflective coating that helps reduce brightness, making them popular for outdoor activities.