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Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright Sun light 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).[1]

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.

Aviators,Aviator sunglasses

Aviators are a sunglass design with oversized teardrop-shaped lenses and a thin metal frame. The design was introduced in 1936 by the Ray-Ban company for issue to U.S. military aviators. Their popularity with pilots, military and law enforcement personnel in the United States has never wavered.[citation needed] As a fashion statement, aviator sunglasses are often made in mirrored, colored, and wrap-around styles. In addition to pilots, Aviator-style sunglasses gained popularity with young people in the late 1960s and continue to be popular, with only a brief fall in demand during the 1990s.

Clip-on glasses

Clip-on glasses are a form of tinted glasses that can be clipped on to eyeglasses for sun protection. An alternative are flip-up glasses.

Faded/Graduated lenses

Faded lenses go from a darker shade at the top to a lighter one at the bottom, so there will be more protection from sunlight the higher one looks through the lens, but the lower one looks through the lens, the less protection is offered. The fashion advantage is that one can wear them indoors without fear of tripping over something and also allowing the user to see. Wearing sunglasses to nightclubs has become common in recent times, where the faded lens comes in handy. The Independent (London), has also referred to these style of sunglasses as the Murphy Lens.[20] Double gradient lenses are dark at the top, light in the middle and dark at the bottom.

Flip-up glasses

Flip-up glasses combine sunglasses and corrective glasses, allowing the wearer to flip up the tinted lenses for indoor use. An alternative are clip-on glasses.

Mirrored wraparound sunglasses

Mirrorshades are sunglasses with a mirrored coating on the surface. Mirrored lenses are an alternative to polarization for UV protection, improving contrast when depth perception is important such as seeing moguls and ice while skiing or snowboarding. The mirrored lens reflects glare to protect the eyes but improves the ability to see contrasts, and mirrored lenses of different colors can expand the range of fashion styles. Their popularity with police officers in the United States has earned them the nickname "cop shades"[citation needed]. The two most popular styles are dual lenses set in metal frames (which are often confused with Aviators, see above) and "Wraparounds" (see below).

Oversized sunglasses

Oversized sunglasses, which were fashionable in the 1980s, are now often used for humorous purposes. They usually come in bright colors with colored lenses and can be purchased cheaply.

The singer Elton John sometimes wore oversized sunglasses on stage in the mid-1970s as part of his Captain Fantastic act.

In the early twenty-first century moderately oversized sunglasses have become a fashion trend. There are many variations, such as the 'Onassis', discussed below, and Dior white sunglasses.

Onassis glasses or "Jackie O's" are very large sunglasses worn by women. This style of sunglasses is said to mimic the kind most famously worn by Jacqueline Kennedy Onassis in the 1960s. The glasses continue to be popular with women, and celebrities may use them, ostensibly to hide from paparazzi.

Oversized sunglasses also offer more protection from sunburn to the larger areas of skin they cover, although sunblock should still be used.

Shutter Shades

Shutter Shades were a fad in the early 1980s. Instead of tinted lenses, they decrease sun exposure by means of a set of parallel, horizontal shutters (like a small window shutter). Analogous to Inuit goggles (see above), the principile is not to filter light, but to decrease the amount of sun rays falling into the wearer's eyes. To provide UV protection, Shutter Shades sometimes use lenses in addition to the shutters; if not, they provide very insufficient protection against ultraviolet radiation and blue light.

Teashades

Teashade sunglasses'Teashades' (sometimes also called "John Lennon glasses" or "Ozzy Glasses", after Ozzy Osbourne) were a type of psychedelic art wire-rim sunglasses that were often worn, usually for purely aesthetic reasons, by members of the 1960s drug counterculture, as well as by opponents of segregation.[citation needed] Rock stars such as Mick Jagger, Roger Daltrey, John Lennon, Jerry Garcia, Liam Gallagher and Ozzy Osbourne, all wore teashades. The original teashade design was made up of medium-sized, perfectly round lenses, supported by pads on the bridge of the nose and a thin wire frame. When teashades became popular in the late 1960s, they were often elaborated: lenses were elaborately colored, mirrored, and degregated, produced in excessively large sizes, and with the wire earpieces exaggerated. A uniquely-colored or darkened glass lens was usually preferred. Modern versions tend to have plastic lenses, as do many other sunglasses. Teashades are hard to find in shops today; however, they can still be found at many costume websites and in some countries.

The term has now fallen into disuse, although references can still be found in literature of the time. 'Teashades' was also used to describe glasses worn to hide the effects of marijuana (conjunctival injection) or 'bloodshot' eyes or the effects of opiates such as heroin (pupillary constriction).

The glasses worn by Seraph in the Matrix films are teashades. Teashades are briefly referenced during a police training seminar in Hunter S. Thompson's novel Fear and Loathing in Las Vegas. Anime characters Ban Mido (GetBackers) and Basara Nekki (Macross 7) are almost never seen without their purple-lensed teashades. Vash the Stampede (Trigun) wears yellow-lens teashades. Main character of Hellsing, Alucard, wears red-lensed teashades. Recently, actress and fashion icon Mary-Kate Olsen and pop music singer Lady Gaga have been seen wearing several variations of teashades. Howard Stern was also known for wearing teashades in the early to mid 90's and never taking them off in public. 

Ray-Ban Wayfarer

The Ray-Ban Wayfarer is a plastic-framed design for sunglasses produced by the Ray-Ban company. Introduced in 1952, the trapezoidal lenses are wider at the top than the bottom and were famously worn by James Dean and other actors. The original frames were black; frames in many different colours were later introduced.

Wraparounds

Wraparounds are a specific design of sunglasses. They are characterized by a single, smooth, semi-circular lens that covers both eyes and much of the same area of the face covered by protective goggles. The lens is usually combined with a minimal plastic frame and single piece of plastic serving as a nosepiece. As an alternative, the glasses can have two lenses, but the design evokes the same semicircle. Wraparound sunglasses are also quite popular in the world of extreme sports.