I am taking the same dosage for breathing and minor arm/leg weakness. Initially, I wasn't taking 60mg 3x, but when I did I got the blurry vision and it was too much. Since, it made me unable to lift not a limb. It was just too much too soon for me.

Anyway, after being coaxed back into taking Mestinon, I have made peace with it. It helps me to breath at night which was big, because the muscles of my lungs could not do their job, while being compressed during my resting.

I would say monitor how long you have the blurry vision. Is it lessening overtime? If so, the Mestinon might be working. If not, you might want to come with the hard facts to your doctor.