The iris in the human eye is another marvel of the human body in what it is and does. The iris is the colored part of a person's eye. It has a dark colored hole in the center called the pupil. The primary function of the iris is to control the size of the pupil, which regulates how much light enters the eye. It should also be noted we don't see objects around us, we...
The iris in the human eye is another marvel of the human body in what it is and does. The iris is the colored part of a person's eye. It has a dark colored hole in the center called the pupil. The primary function of the iris is to control the size of the pupil, which regulates how much light enters the eye. It should also be noted we don't see objects around us, we see the visible light waves that are reflected off those objects. On bright sunny days, the iris constricts the pupil to a small black dot, allowing less of the bright intense light into the eye. If you have ever had an eye examination by an opthalmologist, where your eyes were dilated, you have experienced firsthand the importance of what the iris does. When you went back outside, the intensity of the sunlight was blinding in nature. Painful, because the pupils were dilated and allowing full sunlight into the eye. The iris also has a distinct color to it, with the brown color indicating the most pigment. People with lighter, bluish colored eyes have less of this pigment.
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