i was under the opinion that we used our 'rods' at night....



optidud wrote:
There are far so many references to chromatic aberrations from
achromats and very few if none on prism diagonal (which has a
unique dispersing aberrations on primary colors and not secondary
spectrum) so I set out to find all information I can in the net. I came
across the following site which mentioned that the blue cones of our
eyes are few yet it has the same sensitivity as red and green courtesy
of some unknown blue boosting mechanism. If anyone has update
articles on the mysterious blue cones and detailed methods of achieving
the boosting effect. Lemme know. Thanks. I'd like to understand
the evolutionary process that leads to that selection. Birds have
4 color cones. Some species have more or specific cones including
seeing in the infrared and ultraviolet. Imagine in the not so distant
future when genetic engineering can render this same capability to a man.

http://hyperphysics.phy-astr.gsu.edu...colcon.html#c1

"In 1965 came experimental confirmation of a long expected result - there
are three types of color-sensitive cones in the retina of the human eye,
corresponding roughly to red, green, and blue sensitive detectors.
Painstaking experiments have yielded response curves for three different
kind of cones in the retina of the human eye. The "green" and "red" cones
are mostly packed into the fovea centralis. By population, about 64% of
the cones are red-sensitive, about 32% green sensitive, and about 2%
are blue sensitive. The "blue" cones have the highest sensitivity and are
mostly found outside the fovea. The shapes of the curves are obtained
by measurement of the absorption by the cones, but the relative heights
for the three types are set equal for lack of detailed data. There are
fewer blue cones, but the blue sensitivity is comparable to the others,
so there must be some boosting mechanism. In the final visual
perception, the three types seem to be comparable, but the detailed
process of achieving this is not known."