[michael247]

Interesting thread. I too have seen these specs of light but have always taken it to be some product of our vision system. I can remember "discovering" them when I was much younger (early teens perhaps) but have largely ignored them since. I've recently started meditation, energy work, etc. and have noticed them again on a couple of occasions.
In my case, I've only seen them with my eyes closed, and really only if I focus properly and look for them. They are always moving down and to the left at a fairly constant speed and can only be individually perceived if I follow them. This only lasts for a couple of seconds and I have to shift my "vision" up and to the right and start over again. As for their appearance, I always likened them to stars, but with uniform brightness and a reasonably uniform distribution (though much more dense than the night sky).
Also, at around the same time I'd started noticing these lights, I can remember another somewhat strange visual phenomenon (this too I always assumed was purely physical). My parents had a very busy pattern on their bedroom wallpaper (quite ugly actually) and if I'd lie on the bed and adjust my focus just right (eyes open) certain parts of the pattern would float off of the wall and appear to hover in mid air. I had some control over how far they would move from the wall and would often see how close to me I could make them move before I lost focus. I still think its probably an optical illusion of sorts, but the reality of it at the time was amazing.

eyeoneblack: Your technique sounds fun. I'll be giving it a try also.