두가지 눈추적장치를 사용한 라식 후 중심이탈의 분석

Analysis of Decentration after LASIK with Two Eye-Trackers

Purpose: To evaluate the efficacy of two excimer laser systems with eye-tracker in the term of decentration amount. Methods: We performed LASIK with LaserScan LSXTM (group 1, 39 eyes) and Allegretto WaveTM (group 2, 94 eyes), both of which were equipped with eye-tracker. The amount of decentration was measured on a difference map that was obtained from preoperative and postoperative corneal topography, and was compared between the two groups. Results: The amount of decentration was significantly higher in group 1 (0.39±0.22 mm) than in group 2 (0.29±0.18 mm) (p=0.018). When these groups were subdivided by preoperative spherical equivalent, in case of under -6.0 D, the amount of decentration between the two groups (0.31±0.16 mm in group 1, 0.28±0.15 mm in group 2, p=0.380), whereas in case of over -6.0 D, the amount of decentration was significantly higher in group 1 (0.48±0.26 mm) than in group 2 (0.30±0.21 mm) (p=0.020). Conclusions: Allegretto WaveTM showed better centration ability than LaserScan LSXTM and this superiority was more profound in highly myopic eyes.