Change in Corneal Curvature Before and After Corneal Refractive Corrective Surgery

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  • Nezaki Kengo
    Department of Ophthalmology, Kitasato University School of Medicne

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  • 角膜屈折矯正手術前後の角膜形状の変化

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We used an Orbscan slit scan type, made by Orbtek Inc., to compare the relationships among the Best Fit Spheres (BFS) in anterior and posterior corneal curvatures, corneal thickness, and sectioned corneal area taken at 3-mm from the center before and after refractive corneal surgery therapy. This study consisted of 40 cases with 80 eyes in which laser in situ keratomileusis (LASIK) therapies were performed at our hospital. The average age was 36.5 years. We found that the sectioned corneal area decreased after the LASIK; and at the same time, the BFS were flatten for anterior corneal curvature, and steepen for posterior corneal curvature. Although there were no consistent relationships derived when each BFS change in the anterior and posterior corneal curvatures were separately analyzed, two combined BFS changes, as a total (Y), were found to have a relationship to the changes in the sectioned corneal area (X) in the equation of Y=-0.20X-0.017. We also found that there was a proportional relationship between the changes in the sectioned corneal area and the actual measurements of sectioned corneal thickness. Therefore, we reached the conclusion that the total changes in BFS in the anterior and posterior corneal curvatures were also proportionally related to the amount of sectioned corneal thickness. At present, refractive corneal surgeries, including LASIK, are performed based on data obtained from the analysis of only the anterior corneal curvature. However, if we include the changes in the posterior corneal curvature to the analysis, we may have a more accurate estimation of the final outcome.

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