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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 (). 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. Iris Function: Eye Color Definition It is shaped like a small disc and contains fibers & tissues that connect together. AQUEOUS HUMOR The aqueous humour plays an essential role in the health of your eye. The iris is a circular, colored structure that sits in front of the lens within the coronal plane towards the front of the eye. Structure. Iris The colored part of the eye which helps regulate the amount of light entering the eye. When the circular muscles contract, the size of the pupil decreases and when the radially arranged muscles contract the size of the pupil increases. The iris consists of two layers: the front pigmented fibrovascular layer known as a stroma and, beneath the stroma, pigmented epithelial cells.. 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 of the eye is the part of the eye that is located in between the cornea and lens. 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 is a flat and ring-shaped membrane behind the cornea of the eye with an adjustable circular opening in the center called a pupil. The iris controls the size of the pupil and therefore only lets a certain amount of light to enter the eye; The iris contains two sets of smooth muscles- circular muscles and radial muscles. The pupil has the function of allowing the light outside to enter the eye. 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 controls the amount of light that enters the eye. The iris automatically adjusts the size of the pupil accordingly to the intensity of light received by 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. 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 Anatomy . 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. Its size is controlled by the help of iris. It resides at the bottom part of the pupil right underneath it. In optical terms, the pupil is the eye’s aperture, while the iris is the diaphragm. Eye color is specified by that of the iris. 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