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The optics of Prescription Eyeglasses By: Timothy Gorman: There are estimated 168 million people who wear prescription eyeglasses in the United States. Only a very small percen... means farsightedness. It is the opposite of Myopia. The symptoms are headaches, eye fatigue after reading or watching t... Different types of prescription eyeglasses By: Timothy Gorman: Prescription eyeglasses are glasses that have been prescribed by an optometrist to be worn by someone who has been dia... papers nest to the monitor at the same time. And then there are Double Bifocals, which are rarely prescribed, but when ... Survey conducted on Prescription Eyeglasses By: Timothy Gorman: Prescription eyeglasses and/or contact lenses are worn by over 60% of the nations population today. The end of the yea... information that you can research in your pajamas in your home. ... What are Prescription Eyeglasses made of? By: Timothy Gorman: Prescription eyeglasses are manufactured in a variety of materials. The most basic is the glass lens. The glass lens i... absorbs ultra violet light well. This type of lens is much lighter in weight than the glass lens; however, they are als... Non Prescription Contact Lenses Are the Best Way to Alter Your Look Without Altering Your Sight By: Dave Gonzalez: Today’s world has a staggering 75 million contact lens wearers, with 31 million living within the United States. Thou... lenses are able to transform even the darkest natural eye color into a brighter or lighter shade. These lenses are clea... How long have prescription eyeglasses been around? Timothy GormanFrom documents that were retrieved in Rome in the 13th Century, we know that prescription eyeglasses were available at that time. They were referred to as "spectacles" rather than glasses. Although we do not know for certain when prescription eyeglasses were invented, we do have proof that they did exist during this time period. A portrait done by an artist named Tomas da Modeno portrays a gentleman wearing eyeglasses. Obviously what we do not know is if they are prescription eyeglasses. There are, however, other documents such as a manuscript written by a man that implies that if the he wasn't wearing spectacles, he would not be able to read or write. In the 15th century the printing press was invented which meant more reading material was readily available. Thus, the need for prescription glasses increased. The first reading glasses were held by one hand only during the times that they were needed for reading. It was later in the 17th century when people actually wore the glasses regularly, after an optometrist created them with both earpieces. In those times, a person who was having difficulty with their eyesight would just go in and try on several pairs of prescription eyeglasses until they found a fit for their needs. That changed when Dr. FC Donders wrote the first book on examining the eyes to get prescription eyeglasses. Benjamin Franklin is credited for the invention of the bifocal lens. With a bifocal lens the bottom half is used for reading and the top half is for seeing objects that re further in the distance. The first lenses in the prescription eyeglasses were made from quartz crystal and very low in quality and durability. Then in the early 1900's, Bausch and Lomb created the glass lens. Today most prescription eyeglasses are made from a plastic material that can be polished and tinted like glass lenses. The advantage to the plastic lens is the lighter weight of the prescription eyeglasses as well as the durability is greatly increased. About the Author Timothy Gorman is a successful Webmaster and publisher of Vision-Doctor.com. He provides more discount sunglasses, contact lenses, LASIK information and discount prescription eyeglasses information that you can research in your pajamas in your home. Check below for additional Maui Jim Prescription sun glasses Links and Information |
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