白内障手术前后不同角膜直径下角膜四阶球差的分析

Corneal spherical aberration in patients with cataract before and after operation

目的了解年龄相关性白内障患者手术前后角膜四阶球差(Z40)的分布和变化情况。方法应用Pentacam眼前节分析仪对30例(42眼)年龄相关性白内障患者进行检查,并分析术前及术后3个月时直径分别为6mm、5.5mm、5mm下角膜四阶球差。结果 6mm测量直径下术前、术后角膜四阶球差分别为(0.311±0.147)μm和(0.274±0.145)μm(P=0.254,t=1.147);5.5mm测量直径下术前、术后分别为(0.230±0.109)μm和(0.204±0.116)μm(P=0.302,t=1.039);5mm测量直径下术前、术后分别为(0.157±0.089)μm和(0.141±0.094)μm(P=0.428,t'=0.797)。术前6mm、5.5mm、5mm测量直径下各组间比较有统计学差异,术后6mm、5.5mm、5mm各组间比较有统计学差异。结论角膜四阶球差在白内障患者中存在较大个体差异。术后角膜球差较术前有减小趋势,但差异无统计学意义。角膜球差随瞳孔或入射光线光学直径的减小而减小。

Objective To investigate the distribution and change of corneal spherical aberration（SA）in patients with age-related cataract before and after operation.Methods Forty-two eyes of 30 patients with age-related cataract were examined with a Scheimpflug photography system（Pentacam）.Corneal SA with a virtual pupil diameter of 5,5.5 and 6mm was analyzed 3 months before and after operation.Results The mean corneal SA was（0.311±0.147）μm and（0.274±0.145）μm respectively for the 6mm diameter（P=0.254,t=1.147）,（0.230±0.109）μm and（0.204±0.116）μm respectively for the 5.5mm diameter（P=0.302,t=1.039）,（0.157±0.089）μm and（0.141±0.094）μm respectively for the 5mm diameter before and after operation（P=0.428,t′=0.797）.The mean corneal SA was significantly different in the 6mm,5.5mm and 5mm groups before and after operation.Conclusion The corneal SA varies greatly in patients with cataract,tends to decrease with the shortened optic diameter of pupils or incident light after operation compared with that before operation.