Catherine L'Estrange, aged 11, has Bardet-Biedl syndrome (BBS) which would eventually rob her sight but a new treatment injected into her eyeball could change that

Catherine L’Estrange was diagnosed with a rare genetic condition as a baby and hopes the treatment will allow her to keep reading books.

Catherine L’Estrange, from North Acton in London, is hopeful the surgery will allow her to continue one of her favourite hobbies – reading books