Hi.. Shan.., Thanks for choosing HCM.., RETINITS PIGMENTOSA....Retinitis pigmentosa is the most common of a group of hereditary progressive retinal degenerations or dystrophies...Here, the rods of the retina are involved earlier in the course of the disease, and cone deterioration occurs later. In this progressive degeneration of the retina, the peripheral vision slowly constricts and central vision is usually retained until late in the disease.., TREATMENT... there is no specific cure for retinitis pigmentosa. For years, 1) vitamin A therapy has been recommended for many patients, based on research dating back to the early 1990s. A randomized, controlled trial of vitamins A and E found that 15,000 IU a day of vitamin A palmitate could slow the course of the condition among adults with typical forms . 2) Vitamin E, however, at a 400 IU a day dose appeared to have an adverse effect on the course.., 3) OMEGA 3-rich diet containing docosahexaenoic acid can further slow disease progression. Such a diet includes one to two 3-ounce servings per week of oily fish such as salmon, tuna, herring, mackerel, or sardines. Researchers estimated that the combination of vitamin A plus this diet could provide almost 20 additional years of useful vision for adults who start the regimen in their 30s. 4) STEM CELL REPLACING...An international research team led by Columbia University Medical Center successfully used mouse embryonic stem cells to replace diseased retinal cells and restore sight in a mouse model of retinitis pigmentosa...,it is encouraging...So consult good Ophthalmologist.., and take advise him...thanQ