It could be something serious: either something in the eye like a vein or artery blockage, torn retina or more likely a TIA (transient ischemic attack) that could indicate serious disease of the heart, brain, eye or blood vessels. Last would be a protracted migraine equivalent
See your MD and an Eye MD ophthalmologist ASAP
I have had this very same thing on and off for at least 30 years. I finally found a solution about 10 years ago and at least for me, it has been proven to work within 10 minutes every single time I've seen the pinwheels or tunnel vision. I drink at least 12 ounces of water and it goes away. Most of the time it goes away in much less than 10 minutes. I asked my doctor about it and my cure and what I should do. He shrugged his shoulders and said, "So drink lots of water". This thread makes me wonder if drinking water would help some types of migraines?
So glad I read this feed. I used to experience cluster migraines but about 4 years ago, those gave way to visual migraines. I get them rarely but when I do, it's typically following a workout. It begins with the visual disturbance and is followed up by a headache. The first time it happened, I also experienced numbness on the right sight of my body, especially in my face and hands which was quite scary! I didn't mess around with that - I went immediately to my doctor who sent me to the ER where they made sure I was not experiencing a stroke or something else serious. (It was a rare type of migraine that affected me that day.) When I experience a visual migraine, typically the visual disturbance subsides after 1-2 hours and in that time, I really can't do much especially if it involves looking downward. Cooking, for example, is out of the question because I can't see my hands or my knife! I was experiencing a visual disturbance today and tried this water remedy. It cleared up within ten minutes! Fantastic! I do have a headache now but that will subside soon enough after taking naproxen sodium. Thank you so much for sharing this post.
have mri of region 29 and 30 could be cause of pinwheels or flashing lights would check pituitary tumor also I am not a dr.just similar experience area 29 and 30 inbrain have a kink there in the artery i that area damaged may because of problem also developed seizures check it out insist hey check these areas , have pitutary tumor but they say to small to effect vision but my peripheral vision and depth perception was affected. now my eye is having spasms going on my pitutary glnd wasdiagnosed at my insistence upon going to er for klidescope vision and insisting they check th Pituitary gland which they did not too happy that i suggested it but it came back with small tumor maybe hemorrhaging I was taking a forensic pathology course andi fit the symptoms of a pituitary tumor