More than 90% of people over 50 need correction for presbyopia, an age-related inability of the eye to shift focus from distant to near objects. Conventional lenses (bifocal, trifocal) have been used for more than 200 years, but they have drawbacks such as a limited field of view for each vision task. That requires users to gaze down for near vision, in some cases causing dizziness and discomfort. Some people need three different sets of eyeglasses for reading, computer use, and driving. Progressive lenses, or non-line bifocals, cause some distortion. However, an electro-optic lens uses voltage-control to change the focusing power across the entire aperture, removing these limitations and providing a new way to correct presbyopia.  [SPIE Newsroom, 6 Oct 2009]

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