New Syndrome Various Artists

Usher syndrome, also known as Hallgren syndrome, is a rare recessive genetic disorder that results in a combination of hearing loss and visual impairment, causing deafblindness. The syndrome is classified into three subtypes (I, II, and III) based on the specific genetic mutations involved and their severity, and it is the most common cause of deafblindness worldwide. Named after Scottish ophthalmologist Charles Usher, who studied it in 1914, the condition is currently incurable and occurs at varying rates in different populations, highlighting its significance in genetic research and the need for early diagnosis.

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