_:vb50936840 . _:vb50936840 . _:vb50936840 . _:vb50936840 "A syndrome characterized by a combination of hearing loss and visual impairment."^^ . _:vb50936840 . _:vb50936840 "url:http://en.wikipedia.org/wiki/Usher_syndrome"^^ . _:vb50936840 .