I have recently noticed that looking at the newspaper for a minute or so results in millions of small black dots appearing in my field of view. Even now they are visible against the white of the computer screen. My own theory is that either the rods or the cones in my retina get saturated with the white light leaving a black dot . However I am afraid this might be in my brain rather in my eyes. When I say millions of dots, I see them as closer to each other than the width of this letter I. They are quite small, however, but if I stare at the paper or screen, they get thicker and more obstrusive.