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Ok, more fun info (This is from books on my desk; I didn't know this stuff off-hand.) :)Retina has 6M cones and 120M rodsCones in the fovea are 1.5µm dia and 2.5µm apart. Rods are 2µm diaField of vision is 150° high and 210° wide. Binocular FOV is 130° dia.Rods & Cones are more sparsely space in...

Yes, there is a fundamental limit to what we can perceive. The eye's angular resolution is about 1 arc-minute (which is related to the cones-size Cees mentioned). Here's a few tidbits about the eye :) - Most of the focusing power comes from the cornea. The lens provides accomodation so we can...