Sun glasses are used primarily to protect against the discomfort of exposing the eye to too much light. In particular, people use sunglasses in places where there is exposure to a large amount of light, such as on the beach, in areas covered with snow and under light-emitting spotlights. The sunglasses also protect the eye from damage from ultraviolet radiation that can cause cataracts, eye cancer and degeneration of the retina. In addition, there are glasses with lenses that combine glasses with sunglasses.