For those who have never experienced eye migraine with visual aura, this video is quite accurate. It starts with a blurred spot that grows and starts flashing in rainbow colours on its perimeter after a bit. The perimeter grows and grows into a bigger circle until it leaves together with the blurriness. It's harmless, but if you have it for the first time, it will feel dangerous. So. Maybe this helps someone out there to be better prepared should it hit them. https://www.youtube.com/watch?v=qVFIcF9lyk8