Mine are barely visable little white (tiny circles - a lot of them too sometimes but only if I really pay attention) which I can see when its bright outside and usually under a blue background. Someone correct me if you can but since they move as well these are blood cells? Right? At least that's what I surmised. Again I had a clear bill of health from the eye doctor andbasic neuro came back clear from GP. Still worried about persistent pressure in head though for myself. Got worse tonight at martial arts when I was bending over which was startling. Somehow we just have to push through, I have your same fears but nothing scares me more then losing my neurological functions to something like a brain tumor; so I feel you. I'm also as I said before concerned about uneven pupils (sometimes left sometimes right)