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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 symptoms of the higher order aberrations that naturally occur on a person's optical system (including retina, lens, and cornea). These lenses create sharper vision for people who have problems with blurry or dull vision, as well as help reduce the halos, starbursts, and comet-tails often associated with night time driving. Scratch-resistant coatings can be applied to most plastic lenses giving them similar scratch resistance to glass. Hydrophobic coatings designed to ease cleaning are also available, as are anti-reflective coatings intended to reduce glare, improve night vision and make the wearer's eyes more visible. CR-39 lenses are the most common plastic lenses due to their low weight, high scratch resistance, low dispersion, and low transparency to ultraviolet and infrared radiation. Polycarbonate and Trivex lenses are the lightest and most shatter-resistant, making them the best for impact protection, though polycarbonate offers poor optics due to high dispersion, having a low Abbe number of 31. Not all glasses are designed solely for vision correction but are worn for protection, viewing visual information (such as stereoscopy) or simply just for aesthetic or fashion values. Safety glasses are a kind of eye protection against flying debris or against visible and near visible light or radiation. Sunglasses allow better vision in bright daylight, and may protect against damage from high levels of ultraviolet light. From Wikipedia under the
GNU Free Documentation License Where can i buy new eyeglasses without a prescription by giving my current lenses for them to copy? Q. I am happy with my current lense strength in my eyeglasses. I just want to get a different style frame. I would like give them my existing eyeglasses and i would pick out a new frame. I was able to do this in the past, and now i can't find a store that would do it. An eye exam would just give me thicker lenses and my eyeballs would become lazier over the years and the lenses would become thicker and thicker. Asked by Arthur G - Sun Feb 15 17:48:29 2009 - - 3 Answers - 1 Comments A. If your state licenses Opticians, (not to be confused with Optometrists or Ophthalmologists, which are doctors) one of them can simply read the prescription off your current lenses and make you a copy. You do not require a prescription to do this, and it is perfectly legal. They are not allowed to change the prescription, only make an exact copy of power your lenses currently are. This is done with a machine called a refractometer. Not all states allow this, so simply go into a big chain store at the mall like Pearlevision or Lenscrafters, and they will be able to tell you if its possible. Answered by hell-p-full - Sun Feb 15 19:16:25 2009 Do magnifying eyeglasses allow you to see distant objects in a magnified form? Q. I know how reading glasses work. I want to know about magnifying eyeglasses (glasses you wear). Do they enable you see distant objects (4 meters or more) in a magnified view? Asked by Amar - Wed Feb 10 02:35:59 2010 - - 1 Answers - 0 Comments A. Not technically. If you are talking about glasses you wear, they are actually the same thing as reading glasses, just made specifically for people with farsightedness. People who are nearsighted use minus-powered lenses to lengthen the focal length b/c their eyes are too long. Farsighted people use plus-powered lenses to shorten the focal length b/c their eyes are too short. Reading glasses are made the same (with plus-powers) but are used for people over 40 who cannot focus anymore (the lens inside the eye is no longer flexible). Answered by Wendi - Thu Feb 11 16:34:03 2010 How long does it normally take Cohens Fashion Optical to make a pair of eyeglasses?
Q. I need eyeglasses and I want to know if it will take a long time or a short time. If you've been there please right a review of it. Asked by xoPeacexoLovexoHappinessxo - Wed Dec 16 17:05:19 2009 - - 1 Answers - 0 Comments A. It depends on the individual store. If your lenses are in stock and they have an optician on duty, you will have the glasses in an hour or less. Call the location closest to you to find out if it's possible as most franchise stores do not have someone on hand at all times to cut the lenses. Worked for one of their stores. Answered by Transamgirl - Thu Dec 17 15:43:17 2009 From Yahoo Answer Search: "Eyeglasses" See also:
 tcpalm.com Fri, 13 Aug 2010 02:30:04 GMT+00:00 TCPalm sebastian this past month the Sebastian community surpassed all previous records for the donation of used eyeglasses , eyeglass cases and cell phones. ...  www2.wnct.com Mon, 16 Aug 2010 17:44:38 GMT+00:00 wnct he wears eyeglasses , a suit and a lapel button that reads "Have you seen me?" He looks a lot like Sen. Patrick Leahy, except that he's made of cardboard. ...  recordherald.com Thu, 12 Aug 2010 12:39:16 GMT+00:00 Record Herald "Adams then threatened her and struck her in the chest and took her eyeglasses from her face." Adams took a $20 bill from the yard sale box and also ... From Google News Search: "Eyeglasses"  blogthechurch.files.wordpress.com 550px x 450px | 78.60kB [source page] Why can t I ever find my glasses when they are on top of my head and my keys when they are in my hand Comments Be the first to comment From Yahoo Image Search: "Eyeglasses"  articlesnatch.com unknown ue, 06 Jul 2010 06:21:43 GM Feel some sort of weird when seen this title, especially the phrase internet . eyeglasses. ? Well, internet eye glasses mainly refer to eye wear purchased from online shops. Up to now, as online technology matures on and on, more and more ...  framesdirectblog.com carson hu, 08 Jul 2010 15:33:35 GM Certain sunglasses styles are automatically associated with celebrities. These iconic frames have shaped the eyewear choices of the public for years.  statuseyecare.com Aakash Shah Fri, 02 Jul 2010 13:47:56 GM Your Online Guide for Contact Lenses, Designer . Eyeglasses. , Designer Sunglasses, Hi-Index Lenses , Progressive lenses, Polarized lenses , Transition Lenses , Prescription Sunglasses , Rayban India, Polaroid Sunglasses and Much More ... From Google Blog Search: "Eyeglasses" |
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