The retina lies just inside the choroid and contains the photoreceptor cells. Cone cells can detect color and rod cells cannot. Cone cells are more sensitive to light than rod cells are. Cone cells, but not rod cells, have a visual pigment. Rod cells are most highly concentrated in the center of the retina.
Rods contain the light-absorbing molecule called rhodopsin.
Rods are more light sensitive than cones and are responsible for night vision. All information from the left eye goes to the right visual cortex and all information from the right eye goes to the left visual cortex.