The iris consists of muscle tissue that comprises of a sphincter muscle that causes the pupil to contract and a group of dilator muscles that cause the pupil to dilate. The back surface is covered by a layer of pigmented epithelial tissue. The outer edge is attached to the sclera.
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(2009). Iris. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_630
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DOI: https://doi.org/10.1007/978-0-387-73003-5_630
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