The iris (plural: irides or irises) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. 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. Its size is controlled by the help of iris. Lens Focuses light rays onto the retina. Iris Function: Eye Color Definition AQUEOUS HUMOR The aqueous humour plays an essential role in the health of your eye. 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. The iris automatically adjusts the size of the pupil accordingly to the intensity of light received by the eye. 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. 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. It is shaped like a small disc and contains fibers & tissues that connect together. The iris surrounds a small aperture called the pupil. The lens is transparent, and can be replaced if necessary. Anatomy . The circular muscles are arranged in concentric rings around the pupil, while the radial muscles run radially. And when there is low light, the iris opens up the pupil to let in more light. Iris The colored part of the eye which helps regulate the amount of light entering the eye. Structure. The iris of the eye is the part of the eye that is located in between the cornea and lens. Eye color is specified by that of the iris. It controls the amount of light that enters the eye. The iris controls the amount of light entering the eyes. If the amount of light received by the eye is large (as during the day time), then the iris contracts the pupil (makes the pupil small) and reduces the amount of light entering the eye. When there is bright light, the iris closes the pupil to let in less light. Function of the Iris: The Breakdown. 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 In context|anatomy|lang=en terms the difference between pupil and iris is that pupil is (anatomy) the hole in the middle of the iris of the eye, through which light passes to be focused on the retina while iris is (anatomy) the contractile membrane perforated by the pupil, which adjusts to control the amount of light reaching the retina, and which forms the colored portion of the eye (). 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. 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