Somewhere in a London clinic, AI chip implants restore sight. A woman who had not seen the center of a page in years picked up a crossword puzzle and filled in a word. Her retina had been destroyed by a condition called geographic atrophy — the late, untreatable stage of dry age-related macular degeneration, where the central macula simply ceases to function, cell by cell, until the world loses its middle. The chip now sitting beneath her retina is two millimeters square, roughly the size of a grain of salt. It contains nearly four hundred light-sensitive pixels. It was powered by the infrared beam from a pair of augmented-reality glasses. Her brain did the rest.
AI chip implants that restore sight represent one of the most consequential intersections of neuroscience and machine intelligence in clinical history. But to understand why they work — and why the potential reaches far beyond vision — you have to start with a stranger, more fundamental fact: the brain does not particularly care where its sensory signals originate.
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