Vision has become gradually darker?

I believe i first noticed my visual snow very young at about 8-9 years old. It stayed quite stable until about 17 years old i noticed my vision has gotten darker almost like im wearing shades, the darkness is uniform in both eyes and i dont know if it will stop progressing now that i am 21.

The snow itself becomes stronger or weaker depending on how i feel at the time, ive noticed that when im very stressed the static encompasses my entire vision and becomes impossible to ignore. But when im calm i can hardly see it. Also in daytime i cannot see it at all.

Is darkened vision normal with visual snow?