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Retinitis pigmentosa (RP) is a genetic disorder of the eyes that causes loss of vision. Symptoms include trouble seeing at night and decreased peripheral vision (side vision). As peripheral vision worsens, people may experience 'tunnel vision'. Complete blindness is uncommon. Onset of symptoms is generally gradual and often in childhood.Retinitis pigmentosa is generally inherited from a person's parents. Mutations in one of more than 50 genes are involved. The underlying mechanism involves the progressive ...