目的:应用Pentacam系统对近视LASIK术前角膜后表面地形图分析,探讨地形图与术后视力情况的关系。方法:应用Pentacam眼前节分析仪对患者术前进行表面地形图分析,观察各分类小组术前和术后3,6mo的裸眼视力和最佳矫正视力,观察术前和术后3mo后的散光度数。结果:对称和不对称领结形组、圆形和椭圆形组、不规则形组所占比例为76.13%,19.03%和4.84%,3组比较差异有统计学意义(P<0.05);术后3mo和6mo的裸眼视力均较术前有显著改善(P<0.05),而3mo和6mo的裸眼视力则无明显差异(P>0.05);最佳矫正视力术前、术后3组均无明显区别(P>0.05);但裸眼视力和最佳矫正视力改善情况圆形和椭圆形组最好,对称和不对称领结形组次之,最后为不规则形组。术前、术后3组的散光度数之间有显著性差异(P<0.05),术后3mo与术前差异也有统计学意义(P<0.05)。结论:Pentacam系统在近视LASIK术前角膜后表面地形图的测量分析中应用,发现不同的表面地形图和术后视力恢复情况有相关关系。

AIM:To analyse the corneal topography with Pentacam system before LASIK,and to explore the relationship between the corneal topography and the vision improve-ment.METHODS:The Pentacam system was used to analyse the corneal topography shapes before LASIK,and then the uncorrected eye vision,best-corrected vision and astigmatism degree were observed before and 3,6 months after LASIK.RESULTS:Before operation,the rate of symmetrical bow tie and asymmetrical bow tie patterns was 76.13%,the rate of round and ellipse patterns was 19.03%,and the rate of irregular patterns was 4.84%.The different among the three groups had statistical significance(P<0.05).After LASIK,the uncorrected eye vision and astigmatism degree improved with statistical significance after opera-tion(P<0.05).In the three groups,round and ellipse patterns showed the best results,symmetrical bow tie and asymmetrical bow tie patterns ranked the second,and irregular patterns the third.There was significant difference in each shape when compared in the 3rd and the 6th month after operation(P<0.05).CONCLUSION:Using Pentacam system to analyse the corneal topography,we find that there is a relationship between the corneal topography and the vision improvement.

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