comparison of rods and cones
Answers
There are two types of photoreceptors in the human retina, 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. The central fovea is populated exclusively by cones. There are 3 types of cones which we will refer to as the short-wavelength sensitive cones, the middle-wavelength sensitive cones and the long-wavelength sensitive cones or S-cone, M-cones, and L-cones for short.
The light levels where both are operational are called mesopic.
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Rods
Rod cells are more numerous to cone cells
They are located around the periferry or retina
Sensitive to dim light
Inner end has a small knob
One type of cone is present
Cones :
Cone cells are fewer than rod cells
They are located in the centre of the retina
Sensitive to bright light
Inner end is branched
Three Types of cone is present alloying colour precipitation