I had auras which warned me of migraine pain from HS until after a stroke. For 10 years, I was lucky enough to have neither auras or migraines but the auras returned and now I have them several times a month, no pain, just the 20 minutes of flashing colored lights. My neurologist tried several medicines and Topamax helped the most. I still take 100 mgs each night. My question: Is there anything new to prevent auras? Does anyone really understand what causes them? I have never gotten an answer to that question. I am 79 years old and still dealing with migraines.