Information AboutGlasses |
| CATEGORIES ABOUT GLASSES | |
| corrective lenses | |
| eye | |
| eyewear | |
| ophthalmology | |
| optics | |
| optometry | |
| vision | |
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Glasses, also called '''eyeglasses''' or '''spectacles''', are frames, bearing Lenses worn in front of the Eye s normally for Vision Correction , Eye Protection , or for Protection From UV Rays . Modern glasses are typically supported by pads on the bridge of the Nose and by temples placed over the Ear s. Historical types include the Pince-nez , Monocle , and Lorgnette . Eyeglass frames are commonly made from metal, Horn or plastic. Lenses were originally made from Glass , but many are now made from various types of Plastic , including CR-39 or Polycarbonate . These materials reduce the danger of breakage and weigh less than glass lenses. Some plastics also have more advantageous optical properties than glass, such as better transmission of Visible Light and greater absorption of Ultraviolet Light .1 Some plastics have a greater Index Of Refraction than most types of glass; this is useful in the making of corrective lenses shaped to correct various Vision Abnormalities such as Myopia , allowing thinner lenses for a given Prescription . |
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