The Changes of Posterior Corneal Surface and High-Order Aberrations after Refractive Surgery in Moderate Myopia.
10.3341/kjo.2007.21.3.131
- Author:
Min Joung LEE
1
;
Sang Mok LEE
;
Hyun Ju LEE
;
Won Ryang WEE
;
Jin Hak LEE
;
Mee Kum KIM
Author Information
1. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea. kmk9@snu.ac.kr
- Publication Type:Original Article
- Keywords:
Aberration;
LASEK;
LASIK;
Posterior corneal surface;
Wavefront-guided ablation
- MeSH:
Adult;
*Corneal Topography;
Humans;
Myopia/diagnosis/*physiopathology/*surgery;
Postoperative Period;
*Refractive Surgical Procedures;
Severity of Illness Index
- From:Korean Journal of Ophthalmology
2007;21(3):131-136
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: To compare forward shift of posterior corneal surface and higher-order aberration (HOA) changes after LASIK, LASEK, and wavefront-guided LASEK surgery in moderate myopia METHODS: One hundred eighty four eyes undergoing LASIK, LASEK and wavefront-guided LASEK with VISX STAR S4 were included in this study. The posterior corneal elevation was measured with Orbscan before, 2 and 4 months after surgery. Changes of the elevation were assessed using the difference map generated from preoperative and postoperative elevation maps. The values of higher-order aberrations were evaluated preoperatively and 2 months postoperatively with Wavefront aberrometer. RESULTS: The posterior corneal surface displayed forward shift of 27.2+/-11.45 micrometer, 24.3+/-9.76 micrometer in LASIK group, 23.4+/-10.5 micrometer, 23.6+/-10.55 micrometer in LASEK group, 24.0+/-14.95 micrometer, 28.4+/-14.72 micrometer in wavefront-guided LASEK group at 2 months and 4 months, respectively. There were no statistically significant differences among those three groups, and between 2 and 4 months. The root mean score (RMS) of HOA was increased after LASIK and LASEK (p=0.000, p=0.000, respectively). The mean change of HOA-RMS was significantly smaller in wavefront-guided LASEK than LASIK or LASEK (p=0.000, p=0.000, respectively, Bonferroni-corrected). CONCLUSIONS: The changes of posterior corneal surface forward shift showed no difference among LASIK, LASEK and wavefront-guided LASEK in moderate myopia. HOAs were significantly increased after LASIK and LASEK. The changes of HOAs were significant smaller in wavefront-guided LASEK than LASIK or LASEK.
