Supplementary effect of static cyclotorsion compensation with dynamic cyclotorsion compensation on the refractive and visual outcomes of laser in situ keratomileusis for myopic astigmatism.

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.