I've only had visual snow for a couple years, the worst ever was when I had covid in 2022. I had to drive back from Adelaide on a 7 hour trip and it was insanely stressful because I could hardly discern the shapes of cars, distance and the shoulder of roads.
I've noticed it always get way worse when I'm getting sick, it's just like a constant dotty, white filter over everything I look at, and I technically have good vision, 20/20, but it makes even reading and discerning images and objects really hard.