Those distortions are generally called "auras"[1] (though my experience of them is more like a combination of TV static and tunnel vision). I find them to be po

Those distortions are generally called "auras"[1] (though my experience of them is more like a combination of TV static and tunnel vision). I find them to be potentially more unpleasant than the pain that follows, at least if I am not indoors and sitting down (trying to bike home during that is life-threatening; ditto for driving). 1: https://migraine.com/migraine-symptoms/aura/ https://migraine.com/migraine-symptoms/aura/