How can I prevent occurring migraine aurus? I sometimes have vision loss but have had a eye test and it was okay I get worried when I have these aurus

Good thought. You are correct in wanting to either treat or prevent aura of migraine headache. But prophylactic therapy really hinges upon frequency of the events since this would involve either taking medication daily or shots such as Botox on a regular basis. You don't want to do that if aura is only episodic. But you do want to treat. Write me at: for more direction.
Migraine. Do you get migraine after having visual auras? If yes, then you need better medical management to prevent migraines to decrease auras frequency.