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Mr Tibbot said carrying out keyhole surgery on Stacey "would have been almost impossible, or would have taken the whole day of operating".

But her pregnancy was too far advanced to allow surgeons to perform standard keyhole surgery.

He had four tiny scars in his eye where healthy copies of the gene were injected into the retina at the back of the eye through keyhole surgery.

A nurse has become the first person in the UK to undergo an operation that saw a tumour removed through her eye socket using keyhole surgery.

Keyhole surgery removed it, in July, and Mr Ball is now unlikely to need further treatment.