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The measured percent loss of iris area with pupil enlargement is plotted against the calculated percent loss (or gain) in iris volume using a formula depending on iris area and the centroid (center of mass) for the iris. Although nearly all eyes actually lost area as the pupil enlarged, 37% (95/257) paradoxically were judged to have gained iris volume (values below the x-axis). The proposed explanation for this anomaly is shown in Figures 3 and 4.
