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Changes in Spherical Aberration after Various Corneal Surface Ablation Techniques

 Hyun Seok Ahn  ;  Jae Lim Chung  ;  Eung Kweon Kim  ;  Kyoung Yul Seo  ;  Tae-Im Kim 
 Korean Journal of Ophthalmology, Vol.27(2) : 81-86, 2013 
Journal Title
 Korean Journal of Ophthalmology 
Issue Date
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
Aberration ; Laser epithelial keratomileusis ; Photorefractive keratectomy ; Phototherapeutic keratectomy
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 µm in the PTK group, 0.672 ± 0.200 µm in the PRK group, and 0.143 ± 0.136 µm in the wavefront-guided LASEK group. The mean difference between the preoperative and postoperative corneal SA (ΔSA) was -0.475 µm in the PTK group, 0.402 µm in the PRK group, and -0.143 µm 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.
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1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Eung Kweon(김응권) ORCID logo https://orcid.org/0000-0002-1453-8042
Kim, Tae Im(김태임) ORCID logo https://orcid.org/0000-0001-6414-3842
Seo, Kyuong Yul(서경률) ORCID logo https://orcid.org/0000-0002-9855-1980
Ahn, Hyun Seok(안현석)
Chung, Jae Lim(정재림)
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