India has the largest number of blind children in the world, many of whom are born with cataracts. A simple surgery early in life can reverse this condition. But in India, poverty and lack of access to health care consign most children with congenital cataracts to a life in darkness. Project Prakash was launched in 2004 to provide cataract surgery to older children and young adults who were considered beyond help, because they are past a critical age when vision develops in the brain. The project has so far brought nearly 500 children and young adults into the light, and in the process has revealed surprising insights into how the brain learns to see. Read the full story here.