e severe than
             In autosomal dominant inheritance, the patient has one gene for RP
             paired with one normal gene and has a fifty- percent chance of passing the
             disease to children, even if the spouse is unaffected. In the case of
             autosomal recessive inheritance, there may be no known family history of
             the disorder. Both parents have normal retinas and carry a defective gene.
             There is a twenty-five percent chance that their child will be affected.
             In X-linked inheritance, only men develop the disease, but women can carry
             the gene and may develop a mild form of the disorder.
             The early symptoms include a loss of night vision followed by a loss
             of peripheral vision, and usually begin in early adolescents or young
             adults. In some cases, the ability to see color is lost before peripheral
             vision. Other symptoms can include seeing sparkling lights or similar small
             ...