I started out getting migraines like that - nothing apparently there when I had an eye specialist check it out. I started chiro and it disappeared, however I need to make sure I go to the chiro now every 4-6 weeks so I don't get migraines (don't usually manage to get the headaches with them though). I thought I was starting to have macular degeneration (no middle vision, opposite to tunnel vision) because it went on for a few days originally. Mind you the eye specialist didn't think going to the chiro should be able to "fix" my migraines it seems to for me.