Yeah I get those every once in awhile, it starts with a blurry spot in the middle of my vision (like if I’m reading something, half of the word is blurred out no matter where I look) then half an hour later it goes away but is replaced with a migraine that lasts a few hours. Taking a bunch of ibuprofen helps. I’ve noticed it usually happens when I overexert myself without drinking enough water. Also seems to happen more in cold weather, like maybe it’s something about breathing cold dry air. Luckily it’s not chronic, it only happens once a year or so, but often enough to recognize the pattern.