I have been taking mestinon a while now and my eyes still can't cope if there is a lot of visual stimuli.
Its almost as if they can't move quick enough to focus. It can be very disorientating and I have had several falls because of it.
Welcome to the site and ask as many questions as you like. I think you'll find we are a pretty friendly bunch and if we don't know something we will try and find out!
Nice to meet you
Love
Rach