Static and Dynamic Cyclotorsion Compensation with the Schwind Amaris Laser System: Twelve-Month Refractive and Visual Outcomes

INTRODUCTION: Static (SCC) and dynamic cyclotorsion compensation (DCC) were evaluated in myopic/myopic astigmatism patients undergoing transepithelial photorefractive keratectomy (T-PRK) or femtosecond laser in situ keratomileusis (F-LASIK).
METHODS: This retrospective, nonrandomized case series research comprised 236 eyes from 118 patients who had T-PRK (137 eyes) and F-LASIK (99 eyes). The refractive results at the preoperative and 12th months were compared. The association between SCC and DCC values and pre- and postoperative refractive results was investigated.
RESULTS: SCC in the T-PRK group was 3.34±2.69° and 3.54±2.73° in the F-LASIK group. SCC was 3.38±2.68° in all patients. DCC in the T-PRK group was 1.51±1.07° and 1.74±0.93° in the F-LASIK group. In all patients, DCC was 1.57±0.90°. There was no significant difference between the T-PRK and F-LASIK groups in SCC and DCC (p>0.05). The preoperative trefoil showed a significant association with SCC (p<0.05). DCC was shown to have a significant relationship with postoperative total HOA and trefoil (p<0.001, p<0.05, respectively).
DISCUSSION AND CONCLUSION: Even with aberration-free refractive surgery, successful corneal aberrations and refractive results were achieved 12 months after surgery with minimal SCC and DCC. SCC and preoperative trefoil, as well as DCC and postoperative total HOA and coma, had proportionate relationships.