AIM: To analyze the direction and degree of static cyclotorsion component(SCC)and dynamic cyclotorsion component(DCC)in corneal refractive surgery.

METHODS:Retrospective analysis. Totally 130 patients(260 eyes)with corneal refractive surgery in our hospital, according to the operation method were divided into femtosecond laser-assisted laser in situ keratomileusis(FS-LASIK)group and T-photorefractive keratectomy(T-PRK)group, the differences of the parameters of the two groups were compared; the differences of SCC success rate, SCC, DCC, and the eyeball rotation direction were compared between the two groups; correlation analysis on SCC, DCC and the parameters of postoperative patients were performed.

RESULTS:High order aberrations and spherical aberration in the T-PRK group after operation was higher than those of FS-LASIK group, and the difference was statistically significant(P<0.05); in T-PRK group SCC in the operation was successful in 98 eyes, the success rate was 81.7%; in FS-LASIK group SCC in the operation was successful in 82 eyes, the success rate is 58.6%, the difference of SCC success rate between the two groups was statistically significant(P<0.05); SCC in T-PRK group was 3.52°±2.17° and FS-LASIK group was 3.49°±2.26°, there was no significant difference(P>0.05); DCC in T-PRK group(2.86°±1.14°)was higher than that of FS-LASIK group(2.17°±1.09°), and the difference was statistically significant(P<0.05). There was no statistical difference in the direction of rotation of the eyeball in operation between the two groups(P>0.05). The SCC of subjects in operation was positively correlated with UCVA, BCVA, spherical equivalent refraction and high order aberrations(P<0.05); the DCC of subjects in operation was positively correlated with UCVA and high order aberrations(P<0.05).

CONCLUSION:The success rate of SCC in T-PRK surgery is higher than that in LASIK, DCC in T-PRK surgery is higher than that in LASIK, and accurate measurement of SCC and DCC can be effective to compensate for it.