I have a rare eye condition related to caffeine. If i drink caffeine for a few days (any form - coffee/coke/,,) i get retinal stroke. basically some capillaries in the eye block and i develop blind spot. I see noisy spot for a few days in vision and the visual system adjusts in software and i no longer see the noisy spot. This stopped happening completely since I stopped all caffeine. Some years back I drank coffee for a few days and happened again. Since the topic is heart related I am wondering of there is a connection to blood vessels damage. Maybe caffeine acts as a mild stressor? mild stressors are known to trigger the protective systems and thats why we see the benefits with respect to heart?