Fig. 2From: Mutual comparative analysis: a new topography-guided custom ablation protocol referencing subjective refraction to modify corneal topographic dataSingle-angle polar plots. a: Target induced astigmatism vector (TIA), b: Surgically induced astigmatism vector (SIA), c: Difference vector (DV), d: Correction index (CI). The vector means are plotted as a red diamond (calculated in double-angle vector space) and the standard deviations for the X and Y directions are displayed in the call-out boxBack to article page