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Metal implants designed to retain perfect vision: When children are young and have perfect vision, scientists could implant a metal bulb (almost) shaped exactly like their eyes into their eye sockets (between their actual eye & eye scoket). Leave it in for life, and your eyes will never change shape and you'll never lose your perfect vision. Your skull will grow around it, painlessly (hopefully). It's like braces for your eyes! (I admit, it's kind of dangerous, but with some research and careful design, it could work).