Extreme Close Ups of the Human Eye!!
The average human retina has five million cone receptors on
it. Since the cones are responsible for colour vision, you might suppose that
this equates to a five megapixel equivilant for the human eye.
But there are also a hundred million rods that detect monochrome
contrast, which plays an important role in the sharpness of the image you see.
And even this 105MP is an underestimate because the eye is not a still camera.
You have two eyes (no kidding!) and they continually flick
around to cover a much larger area than your field of view and the composite
image is assembled in the brain - not unlike stitching together a panoramic
photo. In good light, you can distinguish two fine lines if they are seperate
by at least 0.6 arc-minutes (0.01.Degrees).
This gives an equivilant pixel size of 0.3 arc-minutes. If
you take a conservative 120 degrees as your horizontal field of view and 60
degrees in the vertical plane, this translates to ...
576 megapixels of available image data.
Curiously - as a counterpoint to this - most people cannot
distinguish the difference in quality between a 300dpi and a 150dpi photo when
printed at 6x4", when viewed at normal viewing distances.
So: although the human eye and brain when combined can
resolve massive amounts of data, for imaging purposes, 150dpi output is more
than enough to provide adequate data for us to accept the result as
photographic quality.
But don't forget that women have more cones and men have
more rods - I kid you not.Therefore the ladies see colours brighter than gents
but can't see as well when it gets dark.
