Light and dark adaptation involve

A) pupillary reflexes.
B) variations in rod and cone function.
C) changes in the amount of available rhodopsin.
D) All of the choices are correct.

Rhodopsin

A light-sensitive receptor protein found in the photoreceptor cells of the retina, essential for vision in low-light conditions.

Pupillary Reflexes

The automatic adjustments in the diameter of the pupil, in response to the intensity of light and focusing efforts, to regulate the amount of light entering the eye.

Rod Function

The role of rod cells in the eye, primarily responsible for vision at low light levels (scotopic vision).