Figure 4From: Retrospective analysis of changes in the anterior corneal surface after Q value guided LASIK and LASEK in high myopic astigmatism for 3 years The mean spherical aberration between the two groups. Before surgery, the mean spherical aberration (Z4 0) was 0.23 ± 0.08 μm in the LASIK group and 0.22 ± 0.08 μm in the LASEK group (P = 0.129), without difference. Up to 3 years after surgery, the mean spherical aberration was 0.50 ± 0.19 μm in LASIK and 0.61 ± 0.19 μm in LASEK, differed significantly between the two groups (P = 0.029).Back to article page