Yes, the rods are not used at all for regular daytime vision, only for nighttime vision and in dimly-lit environments ("scotopic" vision). The rods are much mor

Yes, the rods are not used at all for regular daytime vision, only for nighttime vision and in dimly-lit environments ("scotopic" vision). The rods are much more sensitive than the cones, but can't detect color. That's why you can't see colors at night. We also have somewhat different spatial sensitivities to the three primaries in a computer display, as far as I know. This is because the cornea and the lens are not perfect optical systems, so they blur the input. This blurring is much stronger at the blue end of the spectrum than in the red end. The retina has evolved to match this, so it has very few blue cones and many more green and red/yellow ones. The result is that we have very low spatial sensitivity to blue. This page: http://www.gamesx.com/misctech/visual.htm http://www.gamesx.com/misctech/visual.htm has a demonstration.