An anonymous reader writes "Looks like we have found a cure for genetic blindness (clinical trial — abstract — paper [PDF] — ABC News video). This gene therapy treatment increases both cone and rod photoreceptor-based vision. These engineered viruses are implanted to do our bidding to restore vision. Clinical trials on 6 children and young people proved the therapy and didn't find any notable side effects." Any blind person, especially any adapted and competent one, who wants to gain the sense of sight would be well advised to study Oliver Sachs's classic piece "To See and Not See."
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