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I think it's actually more like a hole. "The pupil is the sphere that is located in the center of the iris of the eye and that controls the amount of light that enters the eye.[1] It appears black because most of the light entering the pupil is absorbed by the tissues inside the eye. In optical terms, the anatomical pupil is the eye's aperture and the iris is the aperture stop. The image of the pupil as seen from outside the eye is the entrance pupil, which does not exactly correspond to the location and size of the physical pupil because it is magnified by the cornea. On the inner edge lies a prominent structure, the collarette, marking the junction of the embryonic pupillary membrane covering the embryonic pupil." http://en.wikipedia.org/wiki/Pupil

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16y ago

What else can I help you with?