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首页> 外文期刊>Journal of refractive surgery >Equation for corneal asphericity after corneal refractive surgery.
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Equation for corneal asphericity after corneal refractive surgery.

机译：角膜屈光手术后角膜非球面度的方程式。

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PURPOSE: To determine the exact theoretical asphericity after refractive surgery when the parabolic approximation of the Munnerlyn formula is utilized. METHOD: From a least-square analysis and considering the conicoid model for anterior cornea, we calculated the final asphericity (p'-factor) from the preoperative asphericity and the radii before and after surgery. RESULTS: The final p'-factor is given by p'=p(R'3/R3); R' is the final radius of curvature; R is the preoperative radius; and p is the preoperative p'-factor. CONCLUSIONS: This equation for postoperative asphericity may be useful in studying the influence on asphericity of different surgical variables. It allows comparisons of real asphericity with the asphericity that should theoretically result. It also explains the increased spherical aberration after refractive surgery and the deterioration of retinal image quality that some authors have found experimentally.
机译：目的：确定使用Munnerlyn公式的抛物线近似后屈光手术后确切的理论非球面度。方法：通过最小二乘分析并考虑前角膜的圆锥曲线模型，我们从术前的非球面度和手术前后的半径计算出最终的非球面度（p'因子）。结果：最终的p'因子由p'= p（R'3 / R3）给出; R'是最终曲率半径; R是术前半径; p是术前p'因子。结论：该术后非球面度方程可用于研究不同手术变量对非球面度的影响。它允许将实际非球面度与理论上应产生的非球面度进行比较。这也解释了一些作者通过实验发现屈光手术后球差增加和视网膜图像质量下降的原因。

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