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The iris is the pigmented structure in the eye that is capable of contracting and expanding its subunits to open and close the center aperture in order to allow more or less light enter the pupil of the eye to illuminate the retina. It not only allows the eye to adjust to different light levels, but it is also pigmented and has unique striations that allow for biometric security to be possible in iris scans.
Wiki User
∙ 10y ago
Wiki User
∙ 8y agoAn iris is a family of flowers. Some of these irises grow in gardens and some grow wild.
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In science textboolks
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