People undergoing an experimental stem-cell treatment have experienced modest improvements in their vision since the trial began in 2011, but one man had his vision restored from 20/400 -- basically blind -- to 20/40.
"There's a guy walking around who was blind, but now can see," said Gary Rabin, CEO of Advanced Cell Technology, the Massachusetts company that devised the treatment. "With that sort of vision, you can have a driver's license."