Learning to See Again with a Bionic Eye

Degenerative retinal diseases such as retinitis pigmentosa and macular degeneration cause irreversible vision loss in more than 10 million people worldwide. Although there is no cure for these diseases, advances in medicine and technology are enabling the possibility of restoring sight to the blind. Analogous to cochlear implants, retinal prostheses ('bionic eyes') use a grid of electrodes to stimulate surviving retinal cells in order to evoke visual percepts.