Only in prototype form at this stage, but they work!!!!
April 15, 2006 The end is nigh for bifocals, and not a moment too soon. Optical scientists at the University of Arizona have developed new switchable, flat, liquid crystal diffractive eyeglass lenses that can adaptively change their focusing power. The new technology will open the way for a new generation of "smart" eyeglasses with built-in automatic focus. In the foreseeable future, with this technology, you won't change prescription eyeglasses but will have your eyes tested and the optician will dial in a new prescription into the specs you already own. Indeed, we can even see the possibility of geeks doing their own eye tests and creating superglasses designed to focus perfectly depending on what you’re looking at.
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