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Q. What is the purpose of magnification?A. The purpose of magnification is to increase the size of the retinal image so that you can see print or objects more easily. There are four basic ways to do this: enlarge the actual object, bring the object closer, make the object appear larger, or enlarge the object by projecting it electronically onto a screen. Q. What is the best magnifier to use?A. It depends upon the tasks and activities you want to perform. Some magnifiers may be better for certain tasks than others. Second, what you see through a magnifier - your field of view - depends on the strength and design of the magnifier. Q. What types of magnifiers are available?A. There are three common types of magnifiers: hand magnifiers, stand magnifiers, and spectacle magnifiers. The most familiar are the hand magnifiers which many people find comfortable and easy to use. They are portable, relatively light weight, and may be used with or without glasses. The distance between the eye and the lens can be varied at will, which provides a greater working range; however, they must be held steadily at the correct focal distance to obtain maximum benefit. Stand magnifiers have a preset focal distance and rest directly on the surface of the reading material. Some have self-contained illumination for those who need more light. Disadvantages include a reduced visual field, distortion if the image is viewed from an angle, and writing is difficult as the design of some stand magnifiers obstructs the pen. Both hand and stand magnifiers are designed to help with short term "up close" spotting tasks. Reading a newspaper briefly or scanning headlines; reading labels or prices while shopping; seeing dials, gauges, and other controls on appliances; reading telephone numbers, recipes or mail. Spectacle magnifiers are strong reading-only lenses worn like conventional glasses. They use either regular or half-eye frames and have a larger field of view. Although low-powered magnifiers of these three types are available in many stores, all too frequently "over-the-counter" low-powered magnifiers are not strong enough for people with significant vision loss. | |||
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