Have you ever used Dr. Christopher's Eyebright Eyewash? It has cayenne in it, and takes some getting used to, but it gets those eye critters running for the hills. When I first used it, I woke up with my eyes almost swollen shut from all the dead carcasses (sandy stuff) that had come out during the night. It's so hot, you have to work your way up from one drop in like a coke bottle cap full of distilled water. I got up to 4 drops before I ran out of it, but I'm going to get more. Someone once posted a recipe from some guy in India that was garlic and cayenne eyedrops they use over there for parasites. Talk about burning! the garlic in it almost killed me! I had to wash it out. I guess Indians are much stronger than we are.