While taking internally, it puts the accent around the vision area I guess. It was pure luck essentially that this cleared my vision... But now thinking back, if Iodine can dissolve tumors or Acne it just makes sense that it will dissolve whatever junk that needs to be cleared out. I am now working on my hair by dissolving a few drops Iodine into few drops of shampoo, + a tablespoon of diluted borax then dip my fingers in that solution and massage scalp few minutes before doing shampoo. When you wash your hair using borax, you don't need to use as much shampoo and save $ as well as environment. Twice a week is plenty for me. Will report in couple months if any improvement with hair (strenght, more body, lustre). Right now, my hair is thin and looks fatigued, looks nice only for a day or two after shampoo. Will see changes I am pretty confident.