Oh, dear lord, who told you cayenne pepper is good for your eyes. On the contrary, it is very irritating for your eyes. According to what I know, cayenne pepper can lead to a series of side effects such as an eye infection. You know, a virus, bacteria or fungus can enter any corner of your eyes. So you had better keep your eyes away from cayenne pepper. Also, you know, pepper contains capsaicin which will add the pain to your skin. And once it enters your eyes, your eyes will feel burning and stinging. Your eyes will water at that time. Anyway, don' t use cayenne pepper to do anything to your eyes, which will be really silly.