Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes._
They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist which feature lenses that are colored, polarized or darkened._
In the early 20th century they were also known as sun cheaters (cheaters being an American slang term for glasses)._
Many people find direct sunlight too bright for comfort.
During outdoor activities, the human eye can receive more light than usual._
Healthcare professionals recommend eye protection whenever outside to protect the eyes from ultraviolet radiation and blue light, which can cause several serious eye problems._
Sunglasses have long been associated with celebrities and film actors primarily from a desire to mask their identity._
Since the 1940s sunglasses have been popular as a fashion accessory, especially on the beach._