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Jun 12, 2023 · The iris is the circular coloured part of the eye. It is part of the vascular layer of the eye - the other two components are the choroid and the ciliary body. The central opening of the iris is the pupil. Within the iris there are smooth muscle fibers that control the size of the pupil.
Aug 8, 2022 · The iris is the colored part of the eye. Your eye color is determined by a combination of different pigments and saturation levels. Three main pigments are found in the iris: Melanin: A yellow-brown pigment that also determines skin tone. Pheomelanin: A red-orange pigment that causes red hair and is common in green or hazel eyes.
iris, in anatomy, the colored muscular part of the eye surrounding the pupil, the small black opening in the center. The iris is located in front of the lens and behind the cornea. It is bathed in front and behind by a fluid known as the aqueous humor.
Apr 29, 2023 · Muscles in the iris dilate (widen) or constrict (narrow) the pupil to control the amount of light reaching the back of the eye. Directly behind the pupil sits the lens. The lens focuses light toward the back of the eye. The lens changes shape to help the eye focus on objects up close.
Apr 23, 2022 · The iris is the colored part of the eye that controls the amount of light that enters into the eye. It is the most visible part of the eye. The iris lies in front of the crystalline lens and separates the anterior chamber form the posterior chamber. The iris in part of the uveal tract which includes the ciliary body that also lies behind the iris.
Jan 20, 2018 · The iris is the part of your eye that is responsible for allowing light to enter the eye, along with the pupil. The iris is a flat and ring-shaped membrane behind the cornea of the eye...
Iris. The colored part of the eye. The iris is partly responsible for regulating the amount of light permitted to enter the eye. Lens (also called crystalline lens). The transparent structure inside the eye that focuses light rays onto the retina. Lower eyelid. Skin that covers the lower part of the eyeball, including the cornea, when closed.
