The best last-minute tech gifts, gadgets for your mom this Christmas
Tech-savvy moms might appreciate a useful, fun, or relaxing gadget over Christmas. Check out some of our top picks.
Researchers demonstrate flat lenses with focusing power that adjusts based on what the person is viewing.
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switchable liquid crystal diffractive lenses
Researchers at the University of Arizona have demonstrated eyeglass lenses, or what's called switchable liquid crystal diffractive lenses, that could potentially replace biofocals for far-sighted people. The flat lenses have focusing power that adjusts based on what the person is viewing.
Caption by: Bill Detwiler
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