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.

Yellow/Amber and brown-tinted spectacles were also a commonly-prescribed item for people with syphilis in the 19th and early 20th centuries because of the sensitivity to light that was one of the symptoms of the disease.

2.Modern developments
In the early 1900s, the use of sunglasses started to become more widespread, especially among the pioneering stars of silent movies. It is commonly believed that this was to avoid recognition by fans, but the real reason was they often had perennially sore eyes from the powerful arc lights that were needed due to the extremely slow speed film stocks used. The stereotype persisted long after improvements in film quality and the introduction of ultraviolet filters had eliminated this problem. Inexpensive mass-produced sunglasses were introduced to America by Sam Foster in 1929. Foster found a ready market on the beaches of Atlantic City, New Jersey, where he began selling sunglasses under the name Foster Grant from a Woolworth on the Boardwalk.

Sunglasses first became polarized in 1936, when Edwin H. Land began experimenting with making lenses with his patented Polaroid filter.

In 2004, Oakley developed the THUMP, sunglasses with built-in digital audio player. This design has been copied by a number of smaller companies.

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Sunglasses:Uses

Hiding one?? eyes has implications in face-to-face communication: It can hide weeping, being one of the signs of mourning, makes eye contact impossible which can be intimidating, like in the stereotype of the guardian of a chain gang as depicted in Cool Hand Luke, or can show detachment, which is considered cool in some circles. Darkened sunglasses of particular shapes may be in vogue as a fashion accessory. Note that normal glasses are very rarely worn without a practical purpose ??curiously, they can project an image of uncool nerdiness that sunglasses do not have. The impact on nonverbal communication and the cool image are among the reasons for wearing sunglasses by night or indoors. People may also wear sunglasses to hide dilated or contracted pupils or bloodshot eyes (which would reveal drug use), recent physical abuse (such as a black eye), or to compensate for increased photosensitivity. Fashion trends are another reason for wearing sunglasses, particularly designer sunglasses. People with severe visual impairment, such as the blind, 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 abnormal appearance (for example due to cataract) or which jerk uncontrollably (nystagmus) may also do so.

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There are also various words referring to eyepieces with darkened lenses:
.Glares is a term popular in India if the glass is dark. If it is light then Coolers
.Sun spectacles is a term used by some opticians.
.Spekkies is a term used predominantly in southern Australia.
.Sun specs (also sunspecs) is the shortened form of the above term.
.Sunglasses is a term in common usage in Britain and North America, and it is also used when preceded by “pair of”.
.Sun-shades can also refer to the sun-shading eyepiece-type, although the term is not exclusive to these. Also in use is the .derivative abbreviation, shades.
.Dark glasses (also preceded by pair of) - generic term in common usage.
.Sunnies is Australian and New Zealand Slang
.Specs is a common name for sunglasses in North America.
.Smoked spectacles usually refers to the darkened eyepieces worn by blind people.
.Solar Shields Usually refers to the models of sunglasses with large lenses.
.Stunna shades Used as a slang term in the hyphy movement, usually referring to sunglasses with oversized lenses.
.Shades
.Hater blockers
.Locs (also maddoggers) is a term for very dark lensed sunglasses.
Cheaters
.Sang Gleezies (from sunglasses)
.Eyewear is a term used by opticians

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5. Glass lenses are the sharpest. Though high-tech plastics have made great strides, glass lenses are still the best for visual acuity. Glass is ideal for driving and for street wear. But if you participate in sports such as mountain biking where impact is a possibility, seek out lenses made from polycarbonate or CR-39. Plastics are nearly shatterproof and are much lighter than glass.

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