Do you have a history of migraines? It could be opthalmic migraine, a more rare migraine variant (opthamoplegic migraine) or something else entirely.
I would highly recommend consulting a neurologist (and probably an opthamologist as well). Better to be safe than sorry.
Best of Luck!
Post Edited (EvilFluorescents) : 2/1/2011 3:15:39 PM (GMT-7)