[glaugh]

I get the blindness aura thing just before I have a migraine (which doesn't happen much anymore since I stopped accidentally suffocating myself with my pillow..).

The experience for me is absolutely identical to that of a blind spot optical illusion, except bigger and in a different area (just a bit off from the center). It's not generally obvious that there's an issue, the brain fills it in, but if I put text in that part of my vision I'll notice I can't actually read it.