Sunglasses are the protective eyewear which prevents the bright sunlight and protects the eyes from UV rays. It is used by everyone and can be found in various designs. It enhances the style apart from protection.
Spectacles are the pair of lenses which is set in the frame and used to correct the eye vision. It can be of plastic or glass.
|Definition (www.oxforddictionaries.com)||Glasses tinted to protect the eyes from sunlight or glare.||A pair of glasses|
|Purpose||Eye protection as well as esthetic||Necessity for clear vision|
|Synonyms||Dark glasses, colored glasses, eye shield, eyeshade, bifocals||Display, show, demonstration, curiosity, parade|
|History||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.||The first visual aid was invented around 700 years ago.|
|Word origin||The word sunglasses were originated in between 1800-10.||The word spectacles were originated from Middle English: via Old French from Latin spectaculum ‘public show,’ from spectare, frequentative of specere ‘to look.’|
|Lens Material||Glass, acrylic, polycarbonate, CR-39 or polyurethane||Plastic , glass, polycarbonate, trivex, high-index plastic, Aspheric, etc|
|Lens Type||Prescription or non-prescription lenses. photochromic lenses, which are photosensitive, darken when struck by UV light.||Concave, convex and cylindrical Not|
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