In addition to retinitis pigmentosa, what is the other major symptom associated with Usher syndrome?
Usher syndrome accounts for approximately what per percent of all hereditary deaf-blindness cases?
There are 3 types of Usher syndrome with types 1 and 2 accounting for up to 95% of cases in the United States. In relation to vision, what is the main difference between type 1 and type 2?
Which vitamin are researchers studying to determine its impact on the progression of retinal degeneration in individuals with retinitis pigmentosa and Usher syndrome type 2?
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