Which structure regulates the amount of light entering the eye?
a. ciliary body c. pupil
b. lens d. rod
C
The pupil regulates the amount of light entering the eye. The ciliary body is an anterior extension of the uveal tract; it siphons serum from the systemic blood flow to produce the aqueous humor needed to nourish the corneal endothelium. The transparent lens serves as a refracting medium, keeping a viewed object in continual focus on the retina. Its thickness is controlled by the ciliary body. The lens bulges for focusing on near objects and flattens for far objects. The retina contains a high concentration of rods which provide dark and light discrimination and peripheral vision.
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