Stem cell treatment hope for eyes
24 January 2012 Last updated at 18:15 GMT
Early results from the world's first human trial using embryonic stem cells to treat diseases of the eye suggest the method is safe, say researchers.
US firm Advanced Cell Technology told The Lancet how two patients who had received the retinal implants were doing well, four months on.
Trials of the same technique have now started at London's Moorfields Eye Hospital.
Professor James Bainbridge explained the process.