The first human corneas have been 3D bioprinted by a research team at Newcastle University. Newcastle University researchers Steve Swioklo and Che Connon with a dyed cornea. Image credit: Newcastle University. As the protective, outermost layer of the human eye, the cornea has an important role in focusing vision. It is responsible for the transmission and refraction of incident light beams that are in turn focused onto the retina by the lens. Yet...