The Rods and Cones of the Human Eye - HyperPhysics
http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html
WebThe rods are the most numerous of the photoreceptors, some 120 million, and are the more sensitive than the cones. However, they are not sensitive to color. They are responsible for our dark-adapted, or scotopic, vision. The rods are incredibly efficient photoreceptors.
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