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The rods and cones are responsible for chemical reaction of light. Rods are Approximately 125 million in number. These are non-uniformly dispersed on retinal layer. Each of this is approximately 0.002mm in diameter. Rods are responsible for dark light. These cannot distinguish colors (Hecht). Cones are 6-7 million in number. Each cone size was about 0.006mm in diameter. Cones are responsible for colored views. These can distinguish low to high light levels. (Hecht)
by (2.3k points)
The rods and cones are responsible for chemical reaction of light. Rods are Approximately 125 million in number. These are non-uniformly dispersed on retinal layer. Each of this is approximately 0.002mm in diameter. Rods are responsible for dark light. These cannot distinguish colors. Cones are 6-7 million in number. Each cone size was about 0.006mm in diameter. Cones are responsible for colored views. These can distinguish low to high light levels.
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