Usher syndrome

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What is Usher syndrome?
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Usher syndrome is a rare genetic disease that affects both hearing and vision. It causes deafness or hearing loss and an eye disease called retinitis pigmentosa (RP). Sometimes, it also causes problems with balance. Researchers have identified three major types of Usher syndrome, designated as types I, II, and III. These types are distinguished by the severity of hearing loss, the presence or absence of balance problems, and the age at which signs and symptoms appear. The types are further divided into subtypes based on their genetic cause.
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