An experimental trial of gene therapy has helped four toddlers - born with one of the most severe forms of childhood blindness - gain "life-changing improvements" to their sight, according to doctors at Moorfields Eye Hospital in London.

A groundbreaking gene therapy has restored sight in four young children born with severe blindness due to a rare genetic deficiency. Scientists at UCL and Moorfields Eye Hospital successfully injected healthy copies of the defective gene into the retina,

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Jace, 6, was born with a rare and aggressive eye condition An experimental trial of gene therapy has helped four toddlers - born with one of the most severe forms of childhood blindness - gain "life-changing improvements" to their sight,