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Efficacy of Static Cyclotorsion Control in LASIK 1. Minoru Tomita, MD, PhD Shinagawa LASIK Center, Tokyo, Japan Purpose: SCHWIND AMARIS excimer laser has high repetition rate of 500 or 750 Hz and 1,050 Hz high-speed turbo eye tracker which actively tracks eye movements in 6 dimensions. In this study, we evaluated the efficacy of using the static cyclotorsion control (SCC) compensation program by comparing visual outcomes with or without SCC. Methods: Patients with preoperative cylinder of over -2.0 D were enrolled. Postoperative visual and refractive outcomes and efficacy of cylinder correction were analyzed and the results were compared. The SCC group included 324 eyes of 252 patients. The control non-SCC group included 385 eyes of 260 patients. The mean attempted cylinder correction was -2.27 ± 0.60 D for the SCC group, and -2.29 ± 0.65 D for the control group, respectively. In all cases, intra-operative dynamic cyclotorsion compensation (DCC) was used. Results: Three months after LASIK, uncorrected distance visual acuity (UDVA) (logMAR) and cylinder were -0.15 ± 0.08 and -0.54 ± 0.31 D, respectively in the SSC group, and -0.14 ± 0.11 and -0.67 ± 0.41 D, respectively in the control group. Significant differences were demonstrated in UDVA and cylinder (Student's t-test, P=0.033 and 0.000002, respectively). No significant difference was demonstrated in corrected distance visual acuity (CDVA). The safety index for the SCC and the control groups were 1.05 and 1.05, respectively, while the efficacy index was 1.00 and 0.98, respectively. Conclusions: For patients with high cylinder, the SCC program is safe and yields significantly better refractive results. |
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