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Definition of Usher syndrome

Usher syndrome: The most common disease that diminishes both hearing and vision, a group of genetic disorders in which retinitis pigmentosa (an eye disease that causes vision to deteriorate over time) is combined with congenital deafness. The hearing loss in a patient with Usher syndrome occurs in both ears as a result of nerve deafness. Some patients also have balance problems because of lack of vestibular reflexes for balance. More than half of all deaf-blind people have Usher syndrome. The syndrome is inherited in an autosomal recessive manner.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=16123
Last Editorial Review: 3/19/2012

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