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LOW VISION DEVICES
Telescopes are used to help distance vision. They may be mounted to a spectacle prescription so the patient can alternate vision from the telescope to the carrier (regular portion) of the lens. Telescopes provide magnification for improved detailed vision, but reduce peripheral field of vision. They are used as spotting devices and are not intended for full time continuous vision.
Microscopes are used to help near vision. They provide good magnification and a relatively large field of view. They are worn like glasses and do not rely on hand/arm strength or dexterity. They require a very close working distance to the object of regard, sometimes just a couple of inches.
Magnifiers are used to help mid-range and near vision. They may be stand mounted, hand held, or a combination. They come in a variety of sizes, shapes, and weights. Some are available with lighting built in. They give less magnification and have a smaller field of view than microscopes, but have longer (near normal) working distance.
Electro-optical systems are used to help reading. They are stand or tabletop mounted. Reading material is placed on a slide, which goes under a scanner that magnifies the image onto a monitor. They provide excellent magnification, contrast and working distance, but are fixed (non-mobile) and have a relatively small field of image view.
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