Changes in Spherical Aberration after Various Corneal Surface Ablation Techniques.
- Author:
Hyun Seok AHN
1
;
Jae Lim CHUNG
;
Eung Kweon KIM
;
Kyoung Yul SEO
;
Tae Im KIM
Author Information
- Publication Type:Original Article ; Clinical Trial ; Comparative Study ; Research Support, Non-U.S. Gov't
- Keywords: Aberration; Laser epithelial keratomileusis; Photorefractive keratectomy; Phototherapeutic keratectomy
- MeSH: Adult; Aged; Corneal Dystrophies, Hereditary/*surgery; Corneal Wavefront Aberration/*surgery; Female; Follow-Up Studies; Humans; Keratomileusis, Laser In Situ/*methods; Male; Middle Aged; Myopia/*surgery; Photorefractive Keratectomy/*methods; Prospective Studies; Treatment Outcome
- From:Korean Journal of Ophthalmology 2013;27(2):81-86
- CountryRepublic of Korea
- Language:English
- Abstract: PURPOSE: The corneal change induced by refractive procedures influence both the postoperative refractive status and the ocular spherical aberration (SA). We evaluated changes in corneal SA after three types of surface ablation: phototherapeutic keratectomy (PTK), myopic photorefractive keratectomy (PRK), and myopic wavefront-guided laser epithelial keratomileusis (LASEK). METHODS: Twenty-six eyes (25 patients) were subjected to PTK 26 eyes (14 patients) to PRK, and 34 eyes (17 patients) to wavefront-guided LASEK. Corneal SA was measured with the iTrace in all patients both preoperatively and 6 months postoperatively. RESULTS: Six months after surgery, mean corneal SA was -0.173 +/- 0.171 micrometer in the PTK group, 0.672 +/- 0.200 micrometer in the PRK group, and 0.143 +/- 0.136 micrometer in the wavefront-guided LASEK group. The mean difference between the preoperative and postoperative corneal SA (DeltaSA) was -0.475 micrometer in the PTK group, 0.402 micrometer in the PRK group, and -0.143 micrometer in the wavefront-guided LASEK group. CONCLUSIONS: Surgically induced changes in corneal SA vary with procedure. The prediction of the pattern of SA change induced by various surface ablation procedures may be helpful for developing future surgical procedures.
