A subretinal implant inserted under the retina of three blind people has allowed them to see shapes and objects within days of the procedure, German scientists report in the journal Proceedings of the Royal Society B. One of the patients surprised researchers by identifying and locating objects on a table; he was also able to walk around a room unaided, approach specific people, tell the time from a clock face, and describe seven different shades of gray in front of him...
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