..Cayenne *could* be used alone, and has beneficial results when used alone, but Dr. Christopher added several herbs to it and created a formula which far speeded, exceeded and improved the effects of Cayenne by itself.
So I am not saying that I think one *should* use Cayenne alone, simply that one *can*, and that, if they do, it will help the eyes. In my experience however, it will also burn like crazy. The first place I ever read of using Cayenne alone as an eyewash was in Lalitha Thomas' book "10 Essential Herbs".
The effects are far better using Dr. Christopher's eyewash formula, which *includes* Cayenne, but has several other herbs in it as well.