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分析近视准分子激光原位角膜磨镶术后，光学切削区偏中心情况，探讨偏中心的原因及预防措施，在近视准分子激光原位角膜磨镶术前及术后，采用计算机辅助角膜地形图分析系统对其中的１５５只眼进行检查，在术前后差异图上，测定光学切削区偏中心数值及方位。并分组进行比较。结果低、中度及高度近视组，术后光学切削区偏中心值分别为０．４５±０．２２ｍｍ及０．４５±０．２５ｍｍ；超高度及极高度近视组，术后光学切削区偏中心值则分别为０．６１±０．２７ｍｍ及０．８８±０．３７ｍｍ。偏中心方位各组间无明显差异，而且右眼与左眼一致，多数位于鼻上象限。结论超高度和极高度近视（屈光度＞－１０．００Ｄ）患者，准分子激光原位角膜磨镶术后光学切削区偏中心程度大于低、中度及高度近视组，其主要原因可能是由于术中角膜基质透明度下降，影响术者对位及患者注视指示灯光所致。
After myopia laser in situ keratomileusis, the eccentric center of the optical cutting area was explored. The reasons of the eccentric center and the preventive measures were analyzed. Before and after the myopia laser in situ keratomileusis, the computer assisted corneal topography Graph analysis system of which 155 eyes were examined in the difference between the preoperative and postoperative chart, the determination of optical cutting area eccentric center value and orientation. And grouped for comparison. Results In the low, moderate and high myopia group, the center values of postoperative optical cutting were 0.45 ± 0.22mm and 0.45 ± 0.25mm respectively. The ultra-height and very high myopia group, the postoperative optical cutting area deviation The center values were 0.61 ± 0.27mm and 0.88 ± 0.37mm, respectively. There was no significant difference between each group in the partial center orientation, and the right eye was consistent with the left eye, with the majority located in the nasal quadrant. Conclusion In patients with ultra-high and very high myopia (refraction> -10.00D), the degree of eccentricity in the optical cutting region after laser in-situ keratomileusis is higher than that in low, moderate and high myopia group, the main reason may be due to surgery The transparency of the corneal stroma decreased, affecting the surgery and patients with gaze caused by the indicator light.