What are the main symptoms of Usher syndrome?
Usher type I are usually born completely deaf or loose the remainder of their hearing during the first year of life. Progressive vision loss due to retinitis pigmentosa is noted in childhood. There are also issues with the inner ear that can cause balance problems and can therefore cause developmental delay.
Usher syndrome type II has mild to severe hearing loss at birth and progressive vision loss that begins in adolescence or adulthood. Individuals do not have balance issues.
Usher syndrome type III experience progressive hearing loss and vision loss that begins in the first few decades of life. The children are usually born with hearing that passes the newborn screening. The hearing loss occurs after the development of speech. By middle age individuals are profoundly deaf. They can experience balance issues due to inner ear problems.
SOURCE: Emory University - Department of Human Genetics in collaboration with ThinkGenetic • https://www.thinkgenetic.com/diseases/usher-syndrome/symptoms/42815 • DATE UPDATED: 2016-07-12