http://www.hale.ndo.co.uk/scotopic/definition.htm
So, it has a name.
Quote:
'visual snow' or 'snowy vision'
Yes, but this follows surfaces, in the dark, helping me to avoid them.
I have also, apparently passed a test for tetrachromatism.
It is reportedly a recessive expression of the red-green color blindness gene, which just so happens to run in my family. In my case, only some of cones are aligned unusually.
The test asks which letter or number is hidden, inside of a colored circle, of red, blue or yellow. A trick question. To my eye, a downward-facing arrow, focused into a 3d representation of a cube, as viewed from the corner.
A greenish haze surrounded a thin blue line, turning violet, as I relaxed my vision.
I have been CT scanned, to see whether the migraines, etc were caused by anything dangerous. Nothing exceptional was revealed, except for that I am bigger than most.