Snow Fall Eye Shader.
 
This Shader Has Settings For
 
Snow Back Ground: Scale, Speed, Coloring, Rotation, Animated Scale, Cloud Depth, and much more.

The Snow flakes in this eye will pan with world space, so if you tilt your head side ways the snow will still fall down as if it where affected by gravity.
EX Video: https://www.youtube.com/watch?v=uwTERex6uDk

Pupil: Coloring, Depth, Scale, Overlay Snow.

Hue Settings.

Vig / Alpha Vig Settings.

Lighting Settings.