This lecture explores the use of photovoltaic technology to restore sight in age-related macular degeneration, focusing on the work of Prof. Daniel Palanker from Stanford University. The lecture covers the structure of the human eye, the dynamic range of photoreceptors, retinal signaling, and the mechanisms of retinal prostheses. It also delves into the results of subretinal implantation in animal models and the first clinical trials in patients, discussing the challenges and lessons learned. The lecture concludes with insights into the future directions of this innovative approach.