Hi stcarlsen, I've suffered from Ocular Migraines for about 18 years now. I only get about 2 really bad attacks a year, used to get more until I learned that anything "sugar free" was feeding them. I normally lose at least 95% of my vision for about an hour and afterwards I can't stand noises, lights, foggy headed, useless for about 2 days (no headache). Anyway, I still find on a daily basis, I see flashing colors, globs of light, sometimes they stay a while, other times they flash and disappear. If the lights "stay a while", a while being up to 2-4 minutes, I normally find within 5 minutes, I'll get a headache. Not a horrible headache, but one you'd take a Tylenol for or it would drive you crazy. Anyway to cut a long story short, lately, I've been having terrible sinus/vertigo problems and my doctor put me on Allegra 180 thinking its allergy related. No joke, since I started them 2 weeks ago, Ive had 2 headaches, and little to no flashing colors. Its sooo weird, those colors have become a part of my normal day and I hate them. Tues to today I had to go off the Allegra because I had an allergy test this morning, and sure enough the flashes started back and I had a whopper of a headache. I took the allegra as soon as I got out of the doctors office and no colors since. I dont know what the connection is, my eye doctor never understood what I was talking about when I talked about these colors. He called them "floaters". I dont know what they are, but they're not floaters