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 ban on female soldiers fighting on the front line could be lifted in 2016, the Ministry of Defence has announced.
A woman who filmed her elderly mum's carer stealing money explained how she felt ill when she discovered the crime.
Showers are set to clear to leave much of England and Wales with plenty of sunshine.