The pupil is a hole in the center of the iris that controls the amount of light entering the eye.
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(2009). Pupil. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_634
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DOI: https://doi.org/10.1007/978-0-387-73003-5_634
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