a physical and chemical change which occurs in the eye of humans as a result of a change in the concentration of light. Most notably the constriction (in excess light) of the pupil or its dilation (in not enough light).
a physical and chemical change which occurs in the eye of humans as a result of a change in the concentration of light. Most notably the constriction (in excess light) of the pupil or its dilation (in not enough light).