Polar Value Analysis of Low to Moderate Astigmatism with Wavefront-Guided Sub-Bowman Keratomileusis

Figure 4

Bivariate analysis of the error of treatment in anterior corneal astigmatism (ACA) (a) and total ocular astigmatism (TOA) (b) following wavefront-guided SBK in 100 eyes. Mean values and 95% confidence areas (solid) of the combined means, expressed as polar values in the preoperatively steeper meridian. The means are shown as follows: preoperative value = triangle to the right; target-induced astigmatism (TIA) = star to the left; surgically induced astigmatism (SIA) = circle to the left; the combined mean of the error of treatment = square in the middle. All values are given in diopters.

(a)

(b)