Suffer chronic migraine . rarely get auras with it ,maybe once a month . this attack aura went and headache started but then aura repeated later on in day . what causes this ? vision still feels slightly off today ?

Some migraines are like this. Many meds wear off? Keep headache diary and share with your team.

All migraines are triggered by internal or external events, and what you describe is not unusual. The visual issue should resolve over next 1-2 days, as the post-dromal situation resolves. Suspect you will do best with an effective preventative approach, such as a CGRP category injection once monthly.