Blind patients hope to gain vision in medical first of CRISPR editing DNA inside their bodies

Gene-editing CRISPR tool is used INSIDE four blind patients' bodies in a world-first attempt to correct their vision without transferring DNA to the lab
Carlene Knight and Michael Kalberer were both born with a rare genetic eye disorder called Leber congenital amaurosis (LCA)
Patients with LCA have genetic mutations that cause rods and cones, cells that detect light in the retina, to not function properly and that lead to vision loss
Knight, 54, from Portland, Oregon, and Kalberer, 43, from Long Island, New York, have volunteered for a gene-editing study using CRISPR technology 
Traditionally, cells with mutations are removed from the body, the defective genes are edited out, and then the cells are inserted back in

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