The average human
retina has five million cone receptors on it and 100 million rods that detect
monochrome contrast. The cone receptors are responsible for color vision and
the rods are play an important role in the sharpness of the image you see.
Both your eyes are
continually flicking around to cover a much larger area than your field of
vision and the composite image is translated in your brain. It’s similar to
stitching together a panoramic photo. In good lighting you can distinguish two
fine lines if they’re separated by at least 0.6 arc-minutes.
That would give
you an equivalent pixel-size of 0.3 arc-minutes. All in all, the human eye has
about 576 megapixels. Women have more cones than men do, and therefore see
colors brighter than their male counterparts. However, due to this, men can see
better at night.
