The Changes of Posterior Corneal Surface and High-Order Aberrations after Refractive Surgery in Moderate Myopia

• Published in: Korean journal of ophthalmology Vol. 21; no. 3; pp. 131 - 136
• Main Authors: Lee, Min Joung, Lee, Sang Mok, Lee, Hyun Ju, Wee, Won Ryang, Lee, Jin Hak, Kim, Mee Kum
• Format: Journal Article
• Language: English
• Published: Korea (South) The Korean Ophthalmological Society 01.09.2007; 대한안과학회
• Subjects: Adult; Corneal Topography; Humans; Myopia - diagnosis; Myopia - physiopathology; Myopia - surgery; Original; Postoperative Period; Refractive Surgical Procedures; Severity of Illness Index; 안과학
• ISSN: 1011-8942; 2092-9382
• DOI: 10.3341/kjo.2007.21.3.131

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 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. 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). 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.