Retinitis pigmentosa is a rod-cone dystrophy, commonly genetic in nature. Approximately 60-80% of those with retinitis pigmentosa inherit it by an autosomal recessive transmission (Brilliant, 1999). There have been some reported cases with no known family history. The symptoms of retinitis pigmentosa are decreased acuity, photophobia, night blindness, and a progressive constriction of the visual field. Visual acuity can vary from 20/20 to no light perception. Typically, acuity is severely affected only in the later stages, when macular changes and glare from posterior subcapsular cataracts may cause moderate to severe vision loss. A person with retinitis pigmentosa has difficulty making the transition between different levels of lighting because of decreased rod-cone function. The visual field loss usually begins in the midperiphery and works in and out, creating a ring scotoma. Owing to the slow, progressive nature of the field loss, many individuals are unaware of it initially.