it's happened to me like 10 times in my life. not sure why. starts as a small area of my visual field and spreads until i am pretty much functionally blind as it blocks my whole field of view. usually accompanied by a dull headache. seems to onset after physical activity, combined with what else, i have no idea(nutrient deficiency maybe?). it's not localized to a particular eye. if i cover one eye, it's still visible through my other eye, so i figure it's in my brain or optical nerve somewhere. i don't imagine there's anything a doctor can do about it so i just wait it out. usually passes in about 30 minutes.
United States