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I do have diplopia, more severe in one eye than the other and double/blurry vision over 50% of the time.
The thing that helps me the most, although much less than ideal, is to hold my eye open while driving. I was on up to 800 mg of Mestinon a day and that did not even help with my vision.
I had an MG crisis and my meds were changed to 50 mg of Azathioprine with 60 mg of Mestinon up to 4 times a day. This has dramatically helped my generalized MG symptoms of weakness in arms and hands and fatigue, however, the problem with my diplopia and vision has not improved at all.
My opthalmologist has suggested a short course of prednisone, but my neurologist has refused to give this a try. I am in search of an appointment with a clinic (Mayo, Cleveland, etc.) for better help with my MG with doctors who have more experience and knowledge of the symptoms and treatmenst.
My very best to you in your search for help with your vision!