Tests carried out on the bionic eye

After 20 years of becoming progressively blind, Chris James is being given the chance to see again.

He suffers from retinitis pigmentosa a condition which affects many thousands of people in Europe and is currently incurable. He is one of the patients participating in a trial of an implant, known as a 'bionic eye', carried out at the John Radcliffe Hospital in Oxford, England.

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