Coverage on BBC Radio 4 Today programme this morning about treatment at Moorfields Eye Hospital involving gene therapy for Leber's congenital amaurosis.
The BBC website reports it here: http://news.bbc.co.uk/1/hi/health/7369740.stm.
The trial itself is reported in the New England Journal of Medicine - an editorial is here, linking to two reports, one of the effect of the therapy, and one on the safety.
There is information about Leber Congenital Amaurosis in Gene Reviews.