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KMID : 0213520130270020081
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Korean Journal of Ophthalmology
2013 Volume.27 No. 2 p.81 ~ p.86
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Changes in Spherical Aberration after Various Corneal Surface Ablation Techniques
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Ahn Hyun-Seok
Chung Jae-Lim
Kim Eung-Kweon
Seo Kyoung-Yul
Kim Tae-Im
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Abstract
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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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KEYWORD
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Aberration, Laser epithelial keratomileusis, Photorefractive keratectomy, Phototherapeutic keratectomy
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