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TRANSPLANTS of fetal eye tissue seem to have improved the vision of two out of four people with a degenerative eye disease. It is too early to be sure the improvements are real and lasting, but on the strength of the results the team pioneering the surgery has asked regulators for permission to carry out further operations.

Before the experimental surgery on her left eye a year ago, Elisabeth Bryant, who is 63, could barely see anything with it. “Now I can see people’s eyes, noses and mouths when they’re sitting across the room from me.” Like the other patients…

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