Maybe soon you'll be able to up the number of drops in the eyecup. Your eyes really will get used to it if you wash them several times a day. I guess you could say the eyes kinda build up a tolerance to the sting and the more drops you use the better/faster the results will be.
Isn't it a wonderful thing when we discover we CAN heal our eyes? I'm working on losing my glasses by using the Eyebright and one of these days I'll be seeing clearly without my glasses YAY!!!