Probably migraine: The "blurry vision" is because your autonomic (automatic) nervous system is unbalanced, the cause of migraine. Commonest cause? Sugar, sweeteners, diet drinks etc.
Answered 2/21/2013
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Migraine: It is possible that the visual distortion that you describe may represent an aura of a migraine. Migraine auras typically occur one hour prior, at onset, or one within the onset of the headache. If this is a new presentation from your typical headaches check with your physician as further investigation may be necessary. Hope you feel better.
Answered 1/27/2015
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