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Glasses - Variation in glasses | | Glasses - Variation in glasses: Encyclopedia II - Glasses - Variation in glasses | | Glasses can be very simple. Magnifying lenses for reading that are used to treat mild hypermetropia and presbyopia can be bought off the shelf, but most glasses are made to a particular prescription, based on degree of myopia or hypermetropia combined with astigmatism. Lenses can be ground to specific eyes, but in most cases standard off-the-shelf prescriptions suffice, but require custom-fitting to particular frames.
As people age, their ability to focus is lessened and many decide to use multiple-focus lenses, bifocal or even trifoc ...
See also:Glasses, Glasses - History, Glasses - Corrective glasses, Glasses - Safety glasses, Glasses - Sunglasses, Glasses - Special glasses, Glasses - Conditions glasses are used to correct, Glasses - Variation in glasses, Glasses - Glasses as a fashion accessory, Glasses - Other names for glasses | | | Glasses, Glasses - Conditions glasses are used to correct, Glasses - Corrective glasses, Glasses - Glasses as a fashion accessory, Glasses - History, Glasses - Other names for glasses, Glasses - Safety glasses, Glasses - Special glasses, Glasses - Sunglasses, Glasses - Variation in glasses, Eye examination, Eyeglass prescription, Sunglasses, Tinted glasses, X-ray vision, Geek chic | | |
| | | Glasses: Encyclopedia II - Glasses - Variation in glasses
Glasses - Variation in glasses
Glasses can be very simple. Magnifying lenses for reading that are used to treat mild hypermetropia and presbyopia can be bought off the shelf, but most glasses are made to a particular prescription, based on degree of myopia or hypermetropia combined with astigmatism. Lenses can be ground to specific eyes, but in most cases standard off-the-shelf prescriptions suffice, but require custom-fitting to particular frames.
As people age, their ability to focus is lessened and many decide to use multiple-focus lenses, bifocal or even trifocal to cover all the situations in which they use their sight. Traditional multifocal lenses have two or three distinct viewing areas, each requiring a conscious effort of refocusing. These were originally separate lenses, as invented by Benjamin Franklin. Some modern multifocal lenses give a smooth transition between these lenses, unnoticeable by most wearers. Others have lenses specifically intended for use with computer monitors at a fixed distance. Many people have several pairs of glasses, one for each task or distance, with specific glasses for reading, computer use, and television watching.
Other related archives1280s, 1604, 1727, 1784, 1827, 3D movies, American, Anne Kirkbride, Arabs, Barry Goldwater, Beatles, Benjamin Franklin, Britain, British, British English, CR-39, Clark Kent, Coronation Street, Corrective lens, Dame Edna Everage, Deirdre Barlow, Dizzy Gillespie, Dominican, Drew Carey, Elton John, Eric Sykes, Eye examination, Eyeglass prescription, Florentine, Geek chic, George Airy, Girolamo Savonarola, Groucho Marx, Hydrophobic, Iron Chef, Italy, Japanese, Johannes Kepler, John Denver, John Lennon, Lisa Loeb, Masaharu Morimoto, Nicholas of Cusa, North American English, Refraction error, Roger Bacon, Spectacles, Sunglasses, Superman, Tinted glasses, US, University of Pisa, Virtual reality, Wonder Woman, X-ray vision, aging, alter egos, anti-reflective coatings, argot, astigmatism, astronomy, bifocal, bifocals, chef, cleaning, concave lens, contact lenses, convex lenses, corrective lenses, crystalline lens, deaf, diopters, ears, eye protection, eyes, focus, geeks, glass, glass eye, goggles, halo effect, hat, hearing aid, hipster, hyperopia, illiterate, illusion of three dimensions, index of refraction, intelligent, knowledge workers, laser eye surgery, lenses, light, longsightedness (hyperopia), lorgnette, magnifying glass, memory metal, monocle, myopia, nerds, nose, ophthalmologist, optical coatings, opticians, optics, optometrist, peer pressure, peripheral vision, persona, photochromic, photosensitive, pince nez, plastic, polarization, polycarbonate, popular culture, presbyopia, prescription, prescription lenses, prosthetic, radiation, shortsightedness (myopia), shutters, slang, stereotype, teen, three-dimensional images, titanium, trifocal, ultraviolet, ultraviolet light, virtual reality, visible, visible light
 Adapted from the Wikipedia article "Variation in glasses", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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