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Thanks for the link, Rick - an interesting read.
Interestingly enough, our eyeballs are like back-thinned CCDs - the rods and cones actually point to the back of the retina (rather than towards the light).
The rods/cones in the peripheral vision and outer macula are effectively "binned" for greater light sensitivity, but the inner macula (fovea) is missing the neuronal connections for binning. This results in the fovea having much sharper - but less light sensitive - vision.
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