Comparison of Higher-order Aberrations (HOAs) between Wavefront-guided Laser in Situ Keratomileusis and Laser Epithelial Keratomileusis.
- Author:
Sang Joon OH
1
;
In Sik LEE
;
Young Ghee LEE
;
Eung Kweon KIM
;
Jun Mo LEE
;
Kyoung Yul SEO
Author Information
1. The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea. seoky@yumc.yonsei.ac.kr
- Publication Type:Original Article
- Keywords:
Higher-order aberrations;
LASEK;
LASIK;
Myopia;
Wavefront
- MeSH:
Coma;
Corneal Topography;
Humans;
Keratectomy, Subepithelial, Laser-Assisted;
Keratomileusis, Laser In Situ*;
Myopia;
Pupil;
Visual Acuity
- From:Journal of the Korean Ophthalmological Society
2004;45(10):1652-1658
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To compare the change in higher-order aberrations (HOAs) in the treatment of myopia between two different Wavefront-guided excimer ablations: laser in situ keratomileusis (LASIK) and laser assisted subepithelial keratomileusis (LASEK). METHODS: One hundred and four eyes of 52 patients were treated with wavefront-guided LASIK while 104 eyes of 54 patients were treated with wavefront-guided LASEK. Pupil size, best-corrected visual acuity (BCVA), uncorrected visual acuity (UCVA), manifest refraction, corneal topography, pachymetry, and wavefront aberrations were examined preoperatively. BCVA, UCVA, manifest refraction, and wavefront aberrations were measured at 1 and 3 months postoperatively. The Hartmann-Shack aberrometer (WaveScan, VISX) was used to measure the overall wavefront aberrations for scotopic pupils. RESULTS: The wavefront error of HOAs did not increase postoperatively in either group compared with preoperative values. Normalized polar Zernike coefficients compared between preoperative and postoperative values showed a statistically significant increase in spherical aberration term in the wavefront-guided LASIK group (p<0.001). Comparing normalized polar Zernike coefficients values between the two groups, the spherical and 2nd coma aberrations at postoperative 1 month in wavefront-guided LASEK were significantly higher than those of the wavefront-guided LASIK group (p=0.002, both). CONCLUSIONS: HOAs did not increase in either wavefront-guided LASIK or wavefront-guided LASEK compared to the previous conventional methods. However, the average RMS wavefront error of the HOAs was lower in the wavefront-guided LASIK group at 1 month postoperatively (p=0.0004).
