For the first time ever, scientists have 3D-printed an array of light sensors onto an eyeball-shaped surface. Eventually, a scaled-up version of the device could restore vision to the blind, or even improve the vision of sighted people. New research published this week in Advanced Materials describes the device. Researchers at the University of Minnesota 3D-printed a light-sensitive array, comprised of silver particles and semiconducting materials, onto a domed surface made of glass.