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When should Prescription Eyeglasses be worn? By: Timothy Gorman: A person should have their eyes examined by an optometrist every two years or every year after the age of 60, to deter... A glaucoma test is a simple, painless test. Glaucoma is a build up of fluid in the eye that causes the retina to have p... 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... the lens, the higher the diopter measures. Prescription eyeglass lenses are measured in positives or negatives. If you ... 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... Bifocal Lens is helpful. The top of the lens is used for distant vision and the bottom of the lens is helpful with clos... How long have prescription eyeglasses been around? By: Timothy Gorman: From documents that were retrieved in Rome in the 13th Century, we know that prescription eyeglasses were available at... reading. It was later in the 17th century when people actually wore the glasses regularly, after an optometrist created... Prescription Eyeglasses Or Contact Lenses Which is Better ? By: Martin Smith: Many means have been used over time to correct vision. The monocle and eyeglass on a stick came before prescription e... the right replacement schedule for you will be decided on. How you wear your contacts will help determine how often you... What are Prescription Eyeglasses made of? Timothy GormanPrescription eyeglasses are manufactured in a variety of materials. The most basic is the glass lens. The glass lens is by far the best in absorbing ultraviolet light. It comes in several different colors and is, of course, scratch resistant. It is also one of the least expensive. The downfall to the glass lens is the weight of a pair of prescription eyeglasses made of glass. They are also very breakable and have to undergo a heat-treated process to ensure durability. Another material used to manufacture prescription eyeglasses is the High-Index plastic lens. It also absorbs ultra violet light well. This type of lens is much lighter in weight than the glass lens; however, they are also very expensive and can be scratched very easily. Resin Plastic is another type of material used in manufacturing the prescription eyeglass lens. They are the lightest of all lenses, but do not offer the high level of protection against ultra violet light that the other lenses offer. Some prescription eyeglasses are tinted with a wide variety of colors and shades. The purpose of the tint is to reduce the glare from certain situations: such as bright lights, computers television sets, etc. Another reason for the tinting of the lenses are to offer comfort to the eyes. Also, people order tints on their eyeglasses for the fashion. Glass and most plastic lenses are coated with a UV protection coating. Ultra violet rays can cause severe damage to the eyes. It is very important to protect your eyes while out in the sun. Another coating that is added to a pair of prescription eyeglasses is the scratch-resistant coating. Sometimes this coating is applied at the manufacturer and other times it can be added right there at the eye doctors office. It must be said, however, that even while this coating can aid in the durability of the lens, it does not make the lens scratch proof. 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 Prescription Sun Glasses Links and Information |
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