Keyword Analysis & Research: how do rods and cones differ functionally


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Do humans have more rods or cones?

The human retina contains about 120 million rod cells, and 6 million cone cells. The number and ratio of rods to cones varies among species, dependent on whether an animal is primarily diurnal or nocturnal.

What is the main function of rods and cones?

What is the main function of rods and cones? Rods are responsible for vision at low light levels (scotopic vision). They do not mediate color vision, and have a low spatial acuity. Cones are active at higher light levels (photopic vision), are capable of color vision and are responsible for high spatial acuity.


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