Difference between rods and cones




Difference between rods and cones

Point of difference RODS CONES
Number More numerous, 125 millions in each eye Less than rods, 7 millions in each eye
Photosynthetic pigment Rhodopsin Iodopsin
Sensitivity Sensitive to light Less sensitive to light
Vision Dim light (Night vision) Bright light
Visual pigment Only one, black-white 3 visual pigment, to differentiate colors
location periphery of retina center of retina
Speed of response to light Slow response: long integration time Fast response: short integration time
Shape of outer segment Cylindrical Conical
Size Small Large
Light level Scotopic Photopic
Absolute sensitivity High Low
Visual acuity Poor; many rods share common neuron connection to brain Good; each cone cell has its own neuron connection to brain

Difference between rods and cones