A genetic disorder with both visual and hearing loss possibilities, Usher syndrome is characterized by hearing impairment as well as an eye disease called retinitis pigmentosa in which vision degenerates (gets worse) over time. Some people with Usher syndrome also have balance problems. Usher syndrome is the most common condition (aside from aging) that affects both hearing and vision. More than half of all deaf-blind people in developed countries (such as the US, Canada, and France) have Usher syndrome.
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