Preliminary results from the first six patients taking part in a Phase One trial surprised and delighted the Oxford University team.
Although the trial was only designed to test safety and dosages, two men with relatively advanced disease experienced dramatic improvements to their eyesight.
The researchers are now planning a larger Phase II trial that will focus on the therapy's effectiveness.
More top news
A woman and man have been charged with murder after a baby was found unresponsive on a bus.
A "very dangerous" tattooed attacker who kidnapped a man before subjecting him to numerous assaults has been jailed for life.
The Duke and Duchess of Cambridge went salmon fishing in Canadian waters on the latest leg of their royal visit to the country.