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This is the central circular opening in the colored part of the eye -- also called the iris. Depending on how much light there is, the iris may contract or dilate, limiting or increasing the amount of light that gets deeper into the eye. The light then goes through the lens.
You should be able to label and describe the functions of the main parts of the eye. Component parts of the eye. Part. Description. Function. Cornea. Tough, transparent covering over the front part of the eye. Convex in shape. Refracts light as it enters the eye (by a fixed amount).Iris. Coloured part of the eye that contains muscles. These relax or contract to adjust the size of the pupil.djust the shape of the lens to make it more or less curved, so as to increase or decrease the refraction of light. Suspensory ligaments. Connect the ciliary muscles to the lens and hold the lens in place. Slacken or stretch as the ciliary muscles contract or relax, to adjust the thickness and curvature of the lens.