title: NEI statement: Update on vitamin A as a treatment for retinitis pigmentosa.
mesh_terms: D002986:Clinical Trials as Topic; D019587:Dietary Supplements; D006801:Humans; D009316:National Institutes of Health (U.S.); D009885:Ophthalmology; D012174:Retinitis Pigmentosa / Q000188:drug therapy*; D014481:United States; D014801:Vitamin A / Q000627:therapeutic use*; D014815:Vitamins / Q000627:therapeutic use*
chemical_list: D014815:Vitamins; D014801:Vitamin A