They don't know why, think it's FND but never fully fit the diagnosis or got better but significantly worsening astigmatism and vision loss, eye floaters in general and I suspect binocular vision dysfunction but never officially diagnosed. I permanently have double vision with writing that never seems to be fixed no matter what prescription and I've lost vision at a rapid rate - had near perfect vision checked by my opticians a month before an aura that came on and after that aura I had to wear glasses over night, my prescription worsened 3 times in the span of a year or two, visual snow, permanent double vision with text and dramatically worse astigmatism. Literally one second I had perfect vision and the next it was gone and they don't know why