i think anti-aliasing and anisotropic filtering play a big part in it, as well as how well you're monitor differentiates between shades in fast-motion scenes.
dots can only be as small as 1 pixel, and on a 27" screen at 1920x1080 1 pixel is fairly big... so the problem isn't the size of the dot, but how fast you're monitor can change from the colour of the water or ground to the colour of the dot.
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