You could have experienced an aura with your migraine. My migraine auras include some of yours, but they last for an hour to a few weeks plus I rarely get a migraine with them.
If you are really worried then talk with your doctor about it. If it happened only once a while ago, then I wouldn't give it much thought. Maybe you didn't eat much that day, had a lot of stress or the weather was changing (I'm learning barometric pressure has effect on my migraine auras).