RETINAL HACK. “Optogenetics is also being considered for a new generation of sensory devices, like retinal implants to help people who have lost their vision regain some degree of sight. Today, the Argus II, a retinal implant made by Second Sight, works by transforming a camera feed into electrical impulses. These travel to an implant inside a person’s eye, where they stimulate surviving photoreceptors and pass visual information to the brain.”
http://www.wsj.com/articles/a-bright-approach-to-brain-implants-1453480543