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Variation of aberration coefficients C20 and C40 with time. Variation of wavefront aberration coefficient C20 (left) and C40 (right) with time for a 3 mm pupil as calculated by the direct (filled symbols) and scaling (open symbols) methods. Data from an artificial eye (upper graphs) and two subjects are shown. The dotted lines are least-square regression coefficients. Note, that the scaling of y axis is different for the artificial eye.
