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Comparison across different central pupil size: (a) the total RMS error from young (2.5 months) and old (14 months) group mice without contact lens; Red dashed line highlights the diffraction-limited RMS. (b) the ratio of total RMS error with and without the contact lens. Red dashed line highlights the line corresponding to ratio = 1. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
