Objective: To compare the static cyclotorsion component (SCC) identification success rate with Femtosecond laser-assisted in situ keratomileusis (FS-LASIK). Methods: In this prospective study, a total of 205 patients (410 eyes) agreed to undergo corneal refractive surgery in Affiliated BenQ Hospital of Nanjing Medical University from July to September 2017. The study included 366 eyes of 183 patients undergoingFS-LASIK as the experimental group and 44 eyes of 22 patients undergoing transepithelial photorefractive keratectomy (TransPRK) as the control group. The 366 eyes undergoing FS-LASIK surgery were divided into a pre-lifting-flap measurement group (130 eyes), a post-lifting-flap measurement group (126 eyes) and a post-lifting-flap recovery measurement group (110 eyes) according to the SCC identification time. Chi-square test was used to analyze the differences in the success rates of SCC in different groups. An independent t test and variance analysis were used to analyze the differences in SCC degrees in different groups. Results: The overall SCC identification success rate was 77.3%. The success rates of the FSLASIK group (366 eyes) and TransPRK group (44 eyes) were 74.9% (274 eyes) and 97.7% (43 eyes), respectively (χ²=11.71, P<0.001). Gender did not have a statistically significant difference on the success rate of SCC. The success rate for right eyes was 82.4% and left eyes was 72.2% (χ²=6.13, P=0.013). The success rates in the pre-lifting-flap measurement group, the post-lifting-flap measurement group and the post-lifting-flap recovery measurement group were 63.8%, 84.1% and 77.3%, respectively (χ²=14.47, P<0.001). Average SCC degree for all subjects was 3.0°±2.3°. There was no statistically significant difference for gender or either eye (right or left). The means for the SCC degrees were 3.1°±2.4° in FSLASIK and 2.2°±1.7° in TransPRK (t=1.99, P=0.007). There was no statistically significant difference in the SCC value between the pre-lifting-flap, the post-lifting-flap and the post-lifting-flap recovery. An SCC greater than 2° accounted for 59.3% of the eyes, greater than 4° accounted for 28.7% and greater than 6° accounted for 9.2%. Conclusion: Measurement after lifting the flap can effectively improve the success rate of SCC identification.
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