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Retinal and Cochlear Implants
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# Retinal and Cochlear Implants Portal: Cybernetics Stage: Cochlear routine, retinal experimental Evidence: Clinical practice Template: Device Risk: Moderate Reversibility: Difficult to reverse Last reviewed: May 2026 == Summary == Sensory implants are the most mature human-machine interfaces: cochlear implants restore useful hearing at scale, while retinal prostheses show how hard vision remains. == Key takeaways == * Cochlear implants are a decades-proven interface, used by hundreds of thousands of people. * Retinal prostheses have restored only crude visual perception and several products were discontinued. * The contrast shows that sensory restoration difficulty scales with the richness of the signal. == Cochlear implants: the mature case == A cochlear implant bypasses damaged hair cells and stimulates the auditory nerve directly, converting sound into patterned electrical pulses. With training, many users understand speech well, and children implanted early can develop spoken language. Cochlear implants are the clearest proof that a permanent neural interface can be safe, durable, and genuinely useful across a large population — the benchmark other neuroprosthetics are measured against. == Retinal prostheses: the hard case == Retinal implants stimulate surviving retinal cells to create spots of perceived light. Early devices restored only coarse perception, and commercial products have been discontinued, leaving some recipients with unsupported implants — a cautionary lesson about device longevity. Vision is a far higher-bandwidth sense than hearing, and the retina performs heavy processing before signals reach the brain. That gap explains why cochlear implants succeeded broadly while restoring rich sight remains unsolved. == Open questions == * Who supports an implant if its manufacturer exits the market? * What resolution is needed before an artificial retina is genuinely useful? == Watchlist == * Device longevity and support obligations * Higher-resolution stimulation * Cortical visual prostheses == References == * Cochlear implants overview — NIDCD (NIH). https://www.nidcd.nih.gov/health/cochlear-implants. Authoritative overview of cochlear implant function and outcomes. * Retinal prosthesis abandonment and support — IEEE Spectrum, 2022. https://spectrum.ieee.org/bionic-eye-obsolete. Reporting on discontinued retinal implants and unsupported recipients. == Categories == [[Category:Cybernetics]] [[Category:cochlear implant]] [[Category:retinal prosthesis]] [[Category:neuroprosthetics]]