, Research Paper
...Syndrome Usher syndrome refers to a deaf-blindness condition. Patients with Usher syndrome have hearing loss and retinitis pigmentosa (RP). RPis characterized by difficulty in balance, loss of peripheral vision, night blindness, retinal degeneration, and finally “tunnel vision” (National Institutes of Health, 2011). Usher syndrome accounts for fifty percent of deafness and blindness cases. It occurs in 1 of 23,000 births in the US (Boughman, Vernon, & Shaver, 1983), and 1 in 12,500 in Germany (Otterstedde, Spandau, Blankenagel, Kimberling, & Reisser, 2001). Other countries have reported prevalence within this range. Usher syndrome is an inherited autosomal recessive disorder; symptoms... of...