AIM: To discuss the clinical efficacy, the safety, the thickness range and operating key points of LASIK personal corneal flap made by FS200 femtosecond laser machine.

METHODS: A total of 1 620 eyes of 815 patients underwent LASIK with flaps created by wavelight FS200 femtosecond laser were involved. Corneal flaps thickness in operation was measured, the intraoperative and postoperative complications were observed and summarized.

RESULTS: 98.16% the uncorrected visual acuity(UCVA)postoperation 1d and 100% the UCVA postoperation 1wk reached the best corrected visual acuity preoperation or above; 97.55% of spherical equivalent refractions postoperation 1d and 98.16% of spherical equivalent refractions postoperation 1wk were within ±0.50D; 99.39% of spherical equivalent refractions postoperation 1d and 100% of spherical equivalent refractions postoperation 1wk were within ±1.00D; There were difference of corneal flaps thickness between measured value and preset value(P<0.05); 80 eyes of 70 patients had subconjunctival hemorrhage(4.94%), 40 eyes of 40 patients had bubbles under flap(2.47%), 2 eyes of 2 patients had anterior chamber bubbles(0.12%), 40 eyes of 20 patients bleed in canal(2.47%), 2 eyes of 1 patient bleed in corneal margin(0.12%), 3 eyes of 3 patients had flaps with an marginal uncut area(0.19%), 10 eyes of 10 patients had flaps with an irregular and dislocated margin(0.62%), 1 eye of 1 patient had suction loss during the operation(0.06%), 8 eyes of 7 patients postponed operation(0.49%).

CONCLUSION: FS200 femtosecond laser is safe, comfortable and little complications in the production of LASIK flaps. If the surgeon operate expertly, patients cooperate well and have healthy cornea epithelium, FS200 femtosecond laser can make ultra-thin corneal flap of 90μm safely.