4 4 How The Human Eye and Brain Work Together To See Color
There are thousands of optic discs found tightly stacked inside every cone and rod cell that lines an eye's retina.
Embedded inside the membrane of each optic disc are light-sensitive proteins genetically programmed (by their D esigner , Elohim) to interp re t the specific wavelengths of light that are being absorbed either by the cone or rod and to send that message to the brain. These are the similarities of rods and cones.
Now we will examine their differences.
• As previously stated , there are about 120 million rods that line the surface of every human retina. In contrast, there are about 6 million cones. That's about 20 times more rods than cones in each eye. • Another big difference between rod and cones is where they are located inside the eye. R ods are found along the periphery (the sides) of retina and cones are found concentrated in the back of the retina.
• The biggest difference is that r ods are 1,000 times more sensitive to light than cones. For this reason, rods are responsible for detecting very low levels of light. We use our rods for night vision because only a small amount light waves (photons) can activate a rod. Rods don't help with color vision, which is why at night, we see everything in a gray scale.
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