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In some people, poor balance is an associated problem. Reduced vision may not occur until adolescence or early adulthood. Over time, vision gradually deteriorates until tunnel vision develops and people cannot see objects unless they are directly in front of them. The early symptoms of RP include difficulty seeing in the dark and in different lighting conditions. Children and adults affected by Usher syndrome are usually totally (type 1) or partially (type 2) deaf from birth (known as congenital deafness). Sensory neural hearing loss occurs because the sensitive hair cells inside the ear are damaged. Usher syndrome is a genetic condition that causes sensory neural hearing loss and retinosis pigmentosa (RP).
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