I’ve had them a couple of times, very rarely. Weird but passed after 10-15 minutes. I mentioned it in to my eye doctor and she laughed and said it was nothing, just let it pass. She called them Opthalmic migraines and unfortunately she wrote it down and my wife read the slip I brought home from the doctor. Then she began the research process to determine how to cure me of this ‘it happened twice in my life’ thing. Sigh.
My Doc called them Ocular Migranes and ordered a carotid ultrasound that found a carotid artery about 60% occluded. A couple years of low dose aspirin seemed to reduce the events to about 1 or 2 a month.