Who needs Glass when you’ve got contact lenses that can display video and even detect health problems? What’s more, lenses with these capabilities could one day be created using a 3D printer. Most of today’s 3D printers work with scraps of plastic or metal and turn them into simple objects. But Michael McAlpine at Princeton University and his colleagues have developed a 3D printer that can make a five-layered contact lens, one which emits light into the wearer’s eyes.
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