I'm also experiencing this white light show at the corner of both eyes as well as something I can only describeas "brain zaps" that happens from time to time. I've paid attention to the patterns and when it happens and I've noticed that it happened more often when I smoked weed or cigarettes, and every time I stopped smoking for several days it would go away. I thought maybe it's the cigarettes so I quit smoking cigarettes and weed completely 4 months ago and started vaping instead. The white light flashes did go away but they came back as soon as I started smoking weed again (not cigarettes but still vaping)
Other symptoms I've noticed are dry skin, poor circulation, brain fog, dehydration (which causes headaches)
It feels to me like the blood cells are not getting enough oxygen. Also possible low iron.
I'm not sure if anyone else in this comment section smokes weed or cigarettes but I do know that it definitely has something to do with it because the moment I stop it goes away every time.