A light tap on the side of your head could one day restore your eyesight, according to Mohsen Shahinpoor and his team at the University of New Mexico. The tap would tighten a band of artificial muscle wrapped round your eyeballs, changing their shape and bringing blurry images into focus.

The researchers call their artificial muscle a ?smart eye band.? It will be stitched to the sclera, the tough white outer part of the eyeball, and activated by an electromagnet in a hearing-aid-sized unit fitted behind one ear.
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