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Eyes of a child

发布时间:2019-03-06 04:01:05来源:未知点击:

By Duncan Graham-Rowe 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. The device, which is being developed by Jin-Hui Shen, an ophthalmologist at Vanderbilt 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. Millions of people are given artificial lenses to replace their own lenses when they become clouded by cataracts. But these consist of a single, fixed-focus lens,