i have them to that degree maybe once every 12 to 18 months or so - though having said that, i don't recall any while pregnant or since DD was born. awful horrible things! CT scan and another optic exam showed nothing unusual. the Opto did ask me if i see floaty "worms" in my vision, which i get semi regularly - he has said this is another form of optic migraine. because there are no pain receptors in the eye (just light receptors leading to the optic nerve) we get a painless eye migraine.