Purpose: To evaluate the add-on effect of static cyclotorsion compensation (SCC) over dynamic cyclotorsion compensation (DCC) on the refractive and visual outcomes in patients having laser in situ keratomileusis (LASIK) for myopic astigmatism.
Setting: Private center, Tokyo, Japan.
Design: Comparative study.
Methods: Consecutive patients had LASIK with a target of emmetropia between August 2009 and June 2010. Patients had preoperative myopic astigmatism of 2.0 diopters (D) or greater and more than 3 months of follow-up. Patients had SCC plus DCC treatment (study group) or DCC treatment only (control group).
Results: The 2 groups were similar preoperatively in refraction, visual acuity, and higher-order aberrations (HOAs). After treatment, the refractive outcome in the study group was significantly better than in the control group, with a mean sphere of 0.13 D ± 0.29 (SD) versus 0.17 ± 0.30 D (P=.009), a mean cylinder of -0.11 ± 0.29 D versus -0.19 ± 0.36 D (P<.001), and a mean spherical equivalent of 0.07 ± 0.29 D versus 0.08 ± 0.32 D (P=.020). Astigmatism vector analysis also yielded better outcomes in the study group. However, the 2 groups were statistically similar in postoperative uncorrected and corrected visual acuities and induced HOAs. The mean static cyclotorsion value in the study group was 2.29 ± 1.74 degrees (range 0 to 11.1 degrees).
Conclusion: The combination of SCC and DCC using an aberration-free aspheric ablation profile produced a statistically significant improvement in astigmatism outcomes.
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