AP PSYCHOLOGY

Detailed explanation-1: -The human retina contains about 120 million rod cells, and 6 million cone cells.

Detailed explanation-2: -Despite the fact that perception in typical daytime light levels is dominated by cone-mediated vision, the total number of rods in the human retina (91 million) far exceeds the number of cones (roughly 4.5 million).

Detailed explanation-3: -We can further conclude that the main reason why rods comprise the vast majority (95%) of our photoreceptors is so that, down at exceedingly low light levels, as many as possible of the scarce photons are captured by rods rather than by cones.

Detailed explanation-4: -Cones are a type of photoreceptor cell in the retina. They give us our color vision. Cones are concentrated in the center of our retina in an area called the macula and help us see fine details. The retina has approximately 120 million rods and 6 million cones.

Detailed explanation-5: -Cones are concentrated in the fovea centralis. Rods are absent there but dense elsewhere. Measured density curves for the rods and cones on the retina show an enormous density of cones in the fovea centralis. To them is attributed both color vision and the highest visual acuity.