Sunday, May 1, 2011

Sunglasses



Sunglasses-By Sarah King

Introduction-Sunglasses are forms of eye wear that typically provide protection from the suns rays. Sunglasses can protect eyes from UV rays that can be harmful. Healthcare professionals often recommend wearing some sort of eye protection while outdoors, as the suns rays can often be damaging to the human eye. Today, medical experts recommend wearing sunglasses that can filter out %99-100 of UV rays.

History-The first account of “sunglasses” being used can date back to prehistoric times, when Inuit people wore flatten, walrus ivory “glasses” that had slits to block out the sun. In the 12th century, or possibly earlier, sunglasses made fro

m flat panes of smoky quartz were used in China. James Asycough is accredited with the invention of sunglasses, although the devices he first invented were not intended to block the rays of the sun. he thought that by using black, blue or green tinted lenses, he could

correct vision problems. This was in the mid 18th century, around 1752. In the early 1900’s many celebri

ties started using tinted lenses. It was thought that this was to disguise their identity from fans, but another reason given is that celebrities’ eyes were often red from the powerful lamps that were used then in moviemaking. Sunglasses, however, still remain very popular long after the powerful lamps were replaced.

Biography of Inventor: Very little is know about James Asycough, including his birth date. He died in 1759. James Asycough was an optician and an inventor of scientific instruments. He had a shop in London between 1740 and 1759. Around the year 1752, he introduced spectacles with double-hinged sidepieces.

Impact on the World Today: Today, sunglasses provide protection against UV rays, which can cause cataracts, snow blindness and various forms of eye cancers. Other uses of sunglasses can include people using them to hide abnormal appearances of the eyes, including blindness, cross-eyes and other abnormalities. Sunglasses can be used in outdoor sports, such as volleyball or skiing. However, these sunglasses must have special features, such as shatterproof and impact-resistance.

Different Styles: There are many different types of sun

glasses. One is called aviator, which usually have oversize teardrop shaped lenses held in place by a thin metal frame. The Ray-Ban Company introduced these in 1936. Clip-on glasses are simply a form of tinted glasses that can be clipped on the regular ey

eglasses for protection from the sun. Flip up sunglasses allow the wearer to flip pup the tinted lens, which makes these great for indoor use. Mirrored sunglasses have a metallic, partially reflected coating on the lenses. These glasses improve the ability to see contrasts. Oversized sunglasses were very fashionable in the 1980’s, and were made popular by Jackie Kennedy. Shutter Shades were used to decrease the amount of sun exposure that took place, not to filter the sunlight. These were inspired by the Inuit’s take on sunglasses. Wraparound sunglasses have one, smooth, semi-circular lens that covers both eyes. These sunglasses’ main use is in sports.

Journal Article:

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TH0-44MFXSK-B&_user=10&_coverDate=11%2F15%2F2001&_rdoc=1&_fmt=high&_orig=gateway&_origin=gateway&_sort=d&_docanchor=&view=c&_searchStrId=1737086498&_rerunOrigin=scholar.google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=6935b57b72564a9cf75123e8f1f5be19&searchtype=a

In this journal article, the dangers of UV rays and the protection needed are discussed. In this article, it is discussed that certain sunglass lenses may not provide the right protection from the UV rays. In the journal article, it also discuss’ the current standards that are set for sunglasses.

Sources:

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TH0-44MFXSK-B&_user=10&_coverDate=11%2F15%2F2001&_rdoc=1&_fmt=high&_orig=gateway&_origin=gateway&_sort=d&_docanchor=&view=c&_searchStrId=1737086498&_rerunOrigin=scholar.google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=6935b57b72564a9cf75123e8f1f5be19&searchtype=a

http://en.wikipedia.org/wiki/Sunglasses

http://new-invention.blogspot.com/2008/01/invention-of-sunglasses.html

1 comment:

  1. It is said that the Roman emperor Nero liked to watch gladiator fights with emeralds. These, however, appear to have worked rather like mirrors.


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