矢量分析法在评价角膜屈光手术矫正散光效果中的应用

The application of vector analysis for evaluation of astigmatism correction in the corneal refractivesurgery

散光在屈光不正人群中约占60％，且对视觉质量有一定的影响，其矫正始终是各类视觉矫正手段尤其是角膜屈光手术关注的焦点。以往评价散光矫正效果仅借助术后等效球镜度数或残余柱镜屈光度为定量指标，忽略了轴向及其偏移的影响。鉴于散光具有矢量特性，应用矢量分析方法不仅可以描述散光的大小还能对其方向予以较客观、准确地描述，近年来逐渐被用于评价和分析角膜屈光手术对散光的矫正。本文就目前常见的矢量分析描述方法、评价指标及在分析矫正散光效果等方面的应用予以综述。

Since sixty percent of ametropes obtain astigmatism, which has influence on the visual quality, correcting the astigmatism is always the focus of concerns during visual correction procedures especially for the corneal refractive surgery. The postoperative spherical equivalent or residual cylindrical dioptors was used as quantitative index to evaluate the correction of astigmatism previously; however, such results neglect the effect of astigmatic axis shift on the treatment. Taking astigmatism as a vector parameter could describe the magnitude and direction of astigmatism accurately, thus it was increasingly applied in the evaluation of astigmatism correction. This paper reviews the present vector analysis methods, evaluation indexes and its application for the correction of astigmatism in the corneal refractive surgery.