Unas gafas de sol (o lentes oscuros) son unas gafas a menudo coloreadas u oscurecidas para proteger a los ojos de la luz directa y molesta. Las monturas de las gafas de sol generalmente están fabricadas con metal o con un material sintético, como el plástico o el nylon. Las lentes suelen tener distintos niveles de bloqueo a los rayos ultravioleta (UV). Se sugiere el empleo frecuente de gafas de sol de buena calidad, que se ajusten al rostro de modo que protejan de los rayos que provengan del frente y de los laterales, filtrando adecuadamente los rayos UV que pueden tener efectos nocivos sobre la salud ocular.

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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, featuring 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). The American Optometric Association recommends sunglasses whenever a person is in the sun. to protect the eyes from ultraviolet radiation (UV) and blue light, which can cause several . Its usage is mandatory immediately after some surgical procedures such as LASIK and recommended for a certain time period in dusty areas, when leaving the house and in front of a TV screen or computer monitor after LASEK. 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.

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