There seems to be some confusion as to what floaters are. This link explains it pretty well.
http://www.allaboutvision.com/conditions/spotsfloats.htm
They are not on the surface of the eye, they are shadows of stuff that is floating around in the fluid in the eye.
I first really took notice of them while swimming in an outdoor pool, with white bottoms and sides, with googles on. As I move my head around, the floaters will move about my field of vision with motion that you would expect a piece of debris that is floating to have, e.g., if I jerk my head to the right, the floater will continue to move to the right (with momentum) after my head has stopped, then it will come to a stop.
Most of the time I don't notice them, but occasionally, they are annoying.
Another interesting tidbit about floaters.. For men, an increase in the number of floaters can be a side effect of too much m12 (that is a twelve letter word that begins with m).