The Best for the Eye
June 29th, 2009An eyeglass prescription is a written order by an optometrist, ophthalmologist, orthoptist or an optician for eyeglasses. It specifies the refractive power to which the eyeglasses are to be made in order to correct blurred vision due to refractive errors, including myopia, hyperopia, astigmatism, and presbyopia. It is typically determined using a phoropter, automated refractor, or through the technique of retinoscopy.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.
Eyeglass frames are commonly made from metal or plastic. Lenses were originally made from glass, but many are now made from various types of plastic, including CR-39 and polycarbonate.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. There are many types of Eyewear. But the Prescription Sunglasses must be confirmed by an ophthalmologist. The other typeof Sunglasses can be used according to the surroundings and our style.
Sunglasses may be made with either prescription or non-prescription lenses that are darkened to provide protection against bright visible light and, possibly, ultraviolet (UV) light. Photochromic lenses, which are photosensitive, darken when struck by UV light.
The eyeglasses are of many type like Corrective, Safety, Sunglasses, 3D Glasses, Reading Glasses. Bifocals, trifocals, progressive lenses and Extreme Magnification(Bioptics).
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