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For me, it also seems to be correlated with eating chocolate covered peanuts. Chocolate contains theobromine, which is the chemical that makes chocolate deadly for dogs. Humans metabolize it better, but it is still a toxin. Peanuts are often contaminated by mold that produce aflatoxin. Maybe one...

I've often had a central blind spot that turns into a shimmering C shape and slowly expands and drifts left out my field of view over about 20 to 30 minutes. I don't get a headache. I found that when I take magnesium supplements I don't get these blind spots anymore. If I quit taking magnesium...