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Adobe Somewhere in Paris, in a white room, seated at a white table, a man wearing a headset reminiscent of those worn by VR gamers reached out with his right hand and placed his fingers on a black notebook. This simple motion, which he executed with confidence, was notable for one very important reason: The man had been blind for close to four decades. What was different now was that as part of a clinical trial, genes had been injected into one of his eyes, causing neurons in the retina to produce a light-sensing protein normally found in the slimy bodies of green algae. When the black goggles he was wearing projected video images of his surroundings as a pulsed light beam onto those now-light-sensitive cells, the neurons fired, and the signal traveled up the optic nerve and into the visual processing center of the brain. The genetically modified neurons had become stand-ins for the photoreceptors he had lost many years before to a genetic disease called retinitis pigmentosa.

France generalCity ofUnited kingdomZhuo hua panTodd durhamGensight biologicsSheila nirenbergPaul bernsteinWayne state universityDrug administrationFoundation fighting blindnessUniversity of utah school medicineWeill medical college of cornell universityAlain sahel of the university pittsburghSorbonne universityAlain sahel