What are the tests for usher syndrome?

See below: 11 genetic loci (a segment of chromosome on which a certain gene is located) have been found to cause usher syndrome, and 9 genes have been pinpointed that cause the disorder for types 1, 2, 3. With so many possible genes involved in usher syndrome, genetic tests are not conducted on a widespread basis. Diagnosis of usher syndrome is usually performed through hearing, balance, and vision tests.