caption: Standard graphs for reporting outcomes for astigmatism correction, based on the Alpins Method. Single-angle polar plots for the target induced astigmatism vector (TIA), surgically induced astigmatism vector (SIA), difference vector (DV), and correction index (CI). The vector means are plotted as a red diamond (calculated in double-angle vector space) and the standard deviations for the <PERSON> and Y directions are displayed in the call-out box.
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