What does the eye look like?

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The organs of sight are the eyes. A human eye is shaped like a ball and is about an inch in diameter. The eye is surrounded by a tough white protective covering. At the front of the eye, there is a transparent circular portion in this covering. Just behind this transparent portion is a space filled with a clear liquid. At the back of this space is a circular tissue with a hole in it. The tissue is called the iris, and the hole is the pupil, is a ring of tiny muscles sensitive to light. In bright light, these muscles contract and narrow the pupil. In dim light, the muscles relax and widen the pupil.

If you stand in front of a mirror in a brightly-lit room, you can easily see the pupil of your widen and narrow. Covering one eye with your hand for about a minute and a half. Suddenly remove your hand, and look at the eye that was covered. You will see the pupil narrow.   

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