Can Revitalash cause permanent iris color change?

I have read on the internet that color change could be a side effect and I don't understand how it could possibly scientifically do that... I live Switzerland and some of my lashes had fallen off and I was recommended to use Revitalash. I have only used it twice but if there is a chance of my eye color changing than I'd rather not continue using it... Nothing can happen to my eye color after the two uses right?