The interpreter should always arrange the ligths so that the person can see as well as only possible. ![]() It can be very difficult to see signs and to lipread if one is dazzled. It is especially important to remember light sensitivity in communication situations. One of the common symptoms of RP is photophobia, light sensitivity. ![]() Not everyone who has hearing problem and retinitis pigmentosa has Usher syndrome. Or a person who is visually impaired may develop hearing problem later in life. It is also possible that a person who lost his/her hearing for another disease later develops retinal disease. There are other syndromes that cause loss of hearing and vision but they are more rare than is Usher syndrome. Loss of retinal functions leads to loss of visual field and other changes in vision. Degeneration of the retina means that retinal cells, rods and cones, die very slowly, the rod cells earlier, the cone cells later. Sensorineural hearing loss means that the damaged cells are the hearing cells of the inner ear. The word syndrome means that the disease affects several organs (eyes and ears) in a typical way. Retinitis pigmentosa first affects the pigment epithelium and the rod cells, and later the cone cells and other retinal cells.ĭoctors express themselves saying that Usher syndrom is a "combined loss of hearing and vision" because of sensorineural hearing loss and degeneration of the retina. The outermost layer of the retina is pigment epithelium with pigment containing cells. ![]() The word pigmentosa comes from the word pigment that means colour substance. The word retinitis means inflammation of the retina and is actually a wrong name because RP is not an inflammation but a degeneration of the retina. It becomes increasingly difficult to see in twilight and in the dark. Deafness or partial hearing loss is present at birth (Usher Type I and II) or develops later (Usher Type III) and retinitis pigmentosa develops its symptoms later. Most often both the hearing loss and the retinal disease are caused by the same inherited disorder that is called Usher syndrome. Retinitis pigmentosa is an eye disease that occurs rather often in the deaf and hard of hearing.
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