FS-LASIK and LASEK procedure
Johnson & Johnson, Inc.) was inserted for 7 days
LENS
Standard LASEK and FS-LASIK surgical techniques were performed for all subjects by the same experienced surgeon. In LASEK, a corneal epithelial flap was created with 20% alcohol solution instilled inside the trephine centered on the pupil, leaving a superior hinge. The ablation was performed with EX500 excimer laser (Alcon Laboratories Inc., Fort Worth, TX) over an optical diameter ranging from 6.25 to 6.75 mm, surrounded by a 1.5-mm transition zone. None of the subjects were treated with mitomycin C, and a bandage contact lens (ACUVE OASYS, Johnson & Johnson, Inc.) was inserted for 7 days. In FS-LASIK, a flap with 110 μm depth, 8.5– 9.1 mm diameter, and a superior gas canal 105° in the right eye and 75° in the left eye was created using the Allegretto Wave-Light FS-200 laser (Alcon Laboratories Inc., Fort Worth, TX). Other parameters about flap creation were as follows: side-cut angle was 90°; hinge angle was 50°; and canal width was 1.5 mm in all subjects. The ablation was performed with a repetition rate of 500 kHz and pulse energy of approximately 160nJ, similar to LASEK.