‘Bionic Eye’ lets man ‘See’ Again
(CNN) -- As a teenager, Roger Pontz's eyesight began to fail. Doctors told him there was nothing they could do to save his vision and over the years his sight deteriorated until, by the age of 40, he was completely blind. Pontz had been diagnosed with retinitis pigmentosa, a hereditary eye disease that damages the retina -- a layer of tissue at the back of the eye that converts light to nerve signals and sends them to the brain.