Anatomy . Lens Focuses light rays onto the retina. Iris Function: Eye Color Definition The pupil has the function of allowing the light outside to enter the eye. It resides at the bottom part of the pupil right underneath it. The iris controls the amount of light entering the eyes. Sphincter pupillae muscle (Musculus sphincter pupillae) Iris is a part of the eyeball that serves the regulation of the amount of light that reaches the retina, as it features an opening called the pupil through which the light can pass through. When there is bright light, the iris closes the pupil to let in less light. Iris automatically adjusts the size of Pupil according to the intensity of light.Hence, the iris controls the amount of light entering the eye by adjusting the size of pupil.ExampleIf light is bright, it reduces the size of Pupil,so that less light can enter the eyesIf light is dim, it increases the The circular muscles are arranged in concentric rings around the pupil, while the radial muscles run radially. AQUEOUS HUMOR The aqueous humour plays an essential role in the health of your eye. The iris contains two sets of muscles. In optical terms, the pupil is the eye’s aperture, while the iris is the diaphragm. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae) which pull the iris radially to enlarge the pupil, pulling it in folds. Unbound in its middle to allow the pupil to change size, this structure is connected to the ciliary body—the part of the eye that produces the eye’s fluid (aqueous humor) and regulates contraction and constriction of the iris. The iris is a circular, colored structure that sits in front of the lens within the coronal plane towards the front of the eye. Iris The colored part of the eye which helps regulate the amount of light entering the eye. And when there is low light, the iris opens up the pupil to let in more light. The lens is transparent, and can be replaced if necessary. The iris automatically adjusts the size of the pupil accordingly to the intensity of light received by the eye. Eye color is specified by that of the iris. When the circular muscles contract, the size of the pupil decreases and when the radially arranged muscles contract the size of the pupil increases. Structure. However, the iris is just a muscle controlling the size of the pupil so that the iris can limit the amount of the light entering our eyes. IRIS Iris is a dark muscular diaphragm that controls the size of pupil PUPIL A small opening in the iris is known as a pupil. The iris of the eye is the part of the eye that is located in between the cornea and lens. It controls the amount of light that enters the eye. It is shaped like a small disc and contains fibers & tissues that connect together. The iris is a flat and ring-shaped membrane behind the cornea of the eye with an adjustable circular opening in the center called a pupil. 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