basically
visual snow is something that affects people where it looks like white or black dots are in their vision all the time (not affecting it, just being an annoyance) and looks like this
i always see visual snow and its annoying when i get my attention to it and it honestly gives me headaches if i focus on it for a short period
i dont have a severe case of visual snow (self diagnosed because it at least seems like it) because its only really visible if you notice it, sounds weird but you sort of forget its a thing every once in a while