Keith Martin BM BCh DM MRCP FRCOphth ALCM is an ophthalmologist. He is the inaugural Professor of Ophthalmology at the University of Cambridge and a specialist in the treatment of glaucoma. In 2013, Professor Martin's team tested a novel technique of bio-printing, using an ink jet to recreate layers of ganglion and glial cells from a rat's retina, a process that has been described as 'printing eyeballs'.