Possibly. It could be a simple eye fatigue from improper glasses, but myesthenia does need to be considered.
Possibly. Although myasthenia gravis is one of the causes of double vision, there are several other more common causes. See an ophthalmologist.
My father aged 78 yrs has Myasthenia Gravis. He is under medication for last 6 yrs. His eyes started closing and seeing double vision. What to do?
Medication failure. First, make certain he is taking the medication as advised. If compliance good, then may need to reassess, and perhaps change medication dosing or even type. See neuromuscular specialty neurologist and get addressed.