Uncommon: Vertical diplopia is a sign of eye muscle imbalance, which may well be due to many causes, including trauma (orbital blow out fracture), certain strokes, myasthenia gravis, multiple sclerosis, brain tumors, supra-orbital ridge disease, cavernous sinus thrombosis, myositis affecting eye muscles, even rarely meds. Need to discern the cause.
Answered 11/18/2012
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