I get the same effect on the vision when I drink more than espresso a day, or if I drink on empty stomach and the absorption is quicker. It goes away in a few m

I get the same effect on the vision when I drink more than espresso a day, or if I drink on empty stomach and the absorption is quicker. It goes away in a few minutes, but it’s scary the first time. I believe it’s because caffeine has a vasoconstriction effect, it can reduce blood flow to the retina, the same happens on the brain (lots of small capillaries), that’s why people get headaches on coffee addiction too.