Many people find direct sunlight too bright to be comfortable, especially when reading paper on which the sun directly shines. In outdoor activities like skiing and flying, the eye can receive more light than usual. It has been Suggested to wear these type of glasses whenever outside to protect the eyes from ultraviolet radiation, which can lead to the development of a cataract.

Sunglasses have also been associated with celebrities and film stars primarily due to the desire to disguise self, but in part due to the lighting involved in production being typically stronger than natural light and uncomfortable to the naked eye. Since the 1950s sunglasses have been popular as a fashion statement, especially on the beach.

People with severe visual destruction, such as the like Blindness, often wear sunglasses in order to avoid making others uncomfortable — not seeing eyes may be better than seeing eyes which seem to look in the wrong direction. Those whose eyes have an unusual look may also do so.
Sunglasses can improve visual comfort and visual clarity by protecting the eye from glower.

Good sunglasses are extremely effective "light conditioners." They modify incoming light to match it to your eyes.

History

Sunglasses were first used in China in the 12th century or possibly earlier.

James Ayscough began experimenting with tinted lenses in spectacles in the mid-18th century. These were not "sunglasses" as such; Ayscough believed blue- or green-tinted glass could correct for specific vision impairments. Protection from the sun's rays was not a concern of his.

In the early 1900's, the use of sunglasses started to become more widespread, especially among the pioneering stars of silent movies. But early movie stars did not wear sunglasses as much to avoid being recognized than to protect their eyes from the harshly bright lighting of some early film studios, often taking their sunglasses off only when stepping in front of the camera to shoot a scene.

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