새로운 미세각막절개도의 임상평가

Clinical Evaluation of New Microkeratome

Purpose: To determine dimensions and quality of flaps created with ZyoptixTM XP microkeratome. Methods: Ninety-nine eyes of 50 patients were enrolled in this prospective study. LASIK procedures were performed by a single surgeon, using ZyoptixTM XP microkeratomes (Bausch & Lomb) with 160 ?m, 180 ?m and 200 ?m heads and suction rings with intended flap diameters (IFD) of 8.5 mm and 9.5 mm. Patients’ age, preoperative manifest refraction value, keratometry reading, preoperative central corneal thickness, stromal bed thickness, and flap diameter were recorded. To calculate flap thickness, subtraction pachymetry was used. The microscopic quality of the flap and stromal bed was graded from 0 to 100. Results: The mean thickness of flaps created by ZyoptixTM XP microkeratome was 107.56±13.61 ?m with the 160 ?m head, 132.99±21.03 ?m with the 180 ?m head, and 134.32±14.75 ?m with the 200 ?m head. The actual flap diameter was 9.18 mm for an IFD 8.5 mm and 9.96 mm for an IFD of 9.5 mm. Subjective assessment of the flap and stromal bed, respectively, was 98.32±2.24 and 97.94±3.85 with the 160 ?m head, 97.86±1.73 and 97.97±2.22 with the 180 ?m head, and 97.79±1.17 and 97.72±1.10 with the 200 ?m head. Conclusions: Flaps created with ZyoptixTM XP microkertome were reproducible in their dimensions. The flaps and stromal beds were of high quality.