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Potential therapy for acquired blindness
Hereditary blindness ― caused by a progressive degeneration of the light-sensing cells in the eye ― affects millions of people worldwide. Although the light-sensing cells are lost, cells in deeper layers of the retina, which normally cannot sense light, remain intact. A promising new therapeutic approach based on a technology termed "optogenetics" is to introduce light-sensing proteins into these surviving retinal cells, turning them into "replacement photoreceptors" and thereby restoring vision.

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