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Eyeglasses Stay in Focus

Researchers at UA Optical Sciences Center say the glasses will provide 20/20 vision

One of the minor irritations of getting older is Presbyopia, a loss of flexibility of the lens inside the eye. This leads to wearing bifocals, or even trifocals. Optical scientists at the University of Arizona (UA) believe they can make one pair of glasses do the work of two or three pairs by creating lenses that change focus depending upon where a person looks. One idea uses a camera-like range-finding system. It sends electrical impulses that change the way light focuses as it moves through different areas of each lens. The glasses could be available as early as 2005.