http://accidentalscientist.com/2014/12/why-movies-look-weird-at-48fps-and-games-are-better-at-60fps-and-the-uncanny-valley.html
If your eyes wobble at a known period, they can oscillate so that the light hitting the cones wanders across the cones themselves (each cone is 0.5-40µm across, and the wobble is approximately 1 to 3 photoreceptor widths, although it’s not precise – 150-2500nm). We can use temporal sampling, with a bit of post-processing to generate a higher resolution result than you’d get from just a single, fixed cone. What’s more, eyes are biological systems; we need something to compensate for the fact that the little sack of jelly in your eye is wobbling when you move it anyway, so why not use the extra data for something?