what is mean by iris
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Iris recognition is a method of identifying people based on unique patterns within the ring-shaped region surrounding the pupil of the eye. ... Certain types of contact lenses and glasses can obscure the iris pattern. Iris recognition, like facial recognition, is most often used for security-related applications.
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the iris is really and extension of choroid layer, the hole in the Iris through which light passes (the pupil) is black because no light is reflected from it . the pupil delays or contract depending upon the amount of light available
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