via Scientific American:
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In the U.S., more than 40 percent of 40-year-olds need eyeglasses for reading, and that figure jumps to nearly 70 percent for people aged 80 and older. “As we get older, refractive errors play more significant roles in our lives,” says Gordon Wetzstein, an assistant professor of electrical engineering at Stanford University.
But glasses and contact lenses are not always ideal. If you are farsighted, for example, you do not need glasses to see traffic while driving, but you do need them to read your speedometer or GPS. The best solution in such cases, Wetzstein says, would be vision-correcting displays—screens that wear the glasses for you.
Wetzstein and his colleagues at M.I.T. (where he was formerly based) and the University of California, Berkeley, have developed just such a screen. The vision-correcting display makes two modifications to a standard high-resolution smartphone or tablet screen.