Research suggests that irises do not remain the same for life after all.
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References
Fenker, S. P. & Bowyer, K. W. Proc. IEEE Conf. Comput. Vision Pattern Recog. (in the press).
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Graham-Rowe, D. Ageing eyes hinder biometric scans. Nature (2012). https://doi.org/10.1038/nature.2012.10722
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DOI: https://doi.org/10.1038/nature.2012.10722