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Frequency histograms of C40 and higher-order RMS error. (a) Frequency histograms of the spherical aberration coefficient, C40 for all subjects tested. Comparison between results derived from the direct (upper) and scaling (lower) methods for a 3 mm pupil. Bin width is 0.001. (b) Frequency histograms of the higher-order RMS error for all subjects tested. Comparison between results derived from the direct (upper) and scaling (lower) methods for a 3 mm pupil. Bin width is 0.0025.
