As you walk into a brightly lit room, the black structure in the center of your eye seems to shrink to a tiny black dot. This response is caused by the action of the eye structure called the:
A) cornea.
B) lens.
C) iris.
D) retina.

Question

Quizplus · Accepted Answer

The iris controls the size of the pupil, which is the black structure in the center of the eye. In bright light, the iris contracts the pupil to limit the amount of incoming light and protect the delicate structures within the eye. This results in the perception of the black structure appearing as a tiny black dot.

As You Walk into a Brightly Lit Room, the Black