Glasses
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Details
Glasses also called eyeglasses or spectacles are frames bearing lenses worn in front of the eyes, 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 temple arms placed over the ears. Historical types include the pince-nez, monocle, lorgnette, and scissors-glasses. Eyeglass lenses are commonly made from plastic, including CR-39 and 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. 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. Newer plastic lenses, called izon, can also correct for the higher order aberrations that naturally occur in the surface of our eye.
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GarantieWeitere Informationen
- Allgemeine Informationen
- Sprache Englisch
- Editor Frederic P. Miller, Agnes F. Vandome, John McBrewster
- Titel Glasses
- ISBN 978-613-0-21623-8
- Format Fachbuch
- EAN 9786130216238
- Jahr 2009
- Größe H12mm x B220mm x T150mm
- Untertitel Eye, Corrective Lens, Plastic, Polycarbonate, Ultraviolet, Visible Spectrum, Refractive Index, Eye Disease, Eyeglass Prescription, Myopia, LASIK, Anti-reflective Coating, Hydrophobe, Lens (optics)
- Gewicht 324g
- Genre Medizin
- Anzahl Seiten 232
- Herausgeber Alphascript Publishing
- GTIN 09786130216238
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