@prein my aura’s last about 20 to 30 minutes as well. I take no medicine. They just go through a cycle all by themselves. The optometrist told me that the aura without headaches comes from a drop in blood pressure. What I’ve noticed over the years is that the day before I get them I’ve gotten really stressed out and angry. So I think it’s constricting blood vessels. Taught me to avoid stress and anger!