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Thirty registered severely sight impaired patients have shown significant improvement in their ability to move about and undertake daily tasks after receiving an implantable retinal prosthetic device allowing them to visualise phosphenes. Subjects receiving the Argus II 'are able to detect light and do well with certain performance parameters', claimed Dr Mark Humayun of Southern California. Twenty-nine of the 30 patients were retinitis pigmentosa (RP) sufferers. This disease was also at the centre of another research project looking at the use of electrical stimulation therapy (EST) for treating RP.
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