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Neuroprosthetics (also called neural prosthetics) is a discipline related to neuroscience and biomedical engineering. It is concerned with developing neural prostheses - devices that can replace a sensory modality that might have been damaged as a result of an injury or a disease. Examples from as early as the late 20th Century included cochlear implants that granted the user a very primitive form of hearing, and primitive visual prosthetics that granted a blind recipient abilities such as navigation without the aid of a cane and facial recognition.
Currently, neuroprosthetics has progressed to the point where the following examples are available:
Prerequisites for neuroprosthetic devices are similar to the those listed on the cybernetics main page: A brain with centers capable of processing the data in a manner it's used to, and appropriate nerves that can be utilized by the prosthetics to relay information to the brain. For example, if you were born with normal binocular vision, you cannot properly process input from more than two visual prosthetics, and those prosthetics have to be arranged relative to each other in a manner similar to your original eye placement.