Retinitis pigmentosa is an eye disease in which there is damage to the retina. The retina is the layer of tissue at the back of the inner eye. This layer converts light images to nerve signals and sends them to the brain. Retinitis pigmentosa can run in families. The disorder can be caused by several genetic defects. The cells controlling night vision (rods) are most likely to be affected. However, in some cases, retinal cone cells are damaged the most. The main sign of the disease is the presence of dark deposits in the retina. The main risk factor is a family history of retinitis pigmentosa.
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