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Liquid crystal lenses could make better bifocal glasses


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Lenses made with liquid crystals could lead to eyeglasses that can easily switch between correcting near- and far-sightedness. Bifocal glasses date back to the 18th century, and their design has not fundamentally changed since. Typically, the lower halves of their lenses are shaped for looking at objects that are close, while the upper halves are tailored for distant ones , so a person wearing…

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