A lens implant that can change focus like a natural lens promises to make cataract patients' eyesight almost as good as it was when they were young.rnThe device, which is being developed by Jin-Hui Shen, an ophthalmologist at Van-derbilt University's School of Medicine in Nashville, Tennessee, contains six overlapping lenses. As the muscles in the eye relax, the overlap increases, allowing patients to focus on closer objects.
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