目的:研究国人近视人群角膜前表面散光与眼球散光的关系,为眼屈光手术设计提供参考。方法:连续性资料358眼。采用日本TOMEY公司的TMS-4角膜地形图仪进行角膜前表面地形图检查,获取角膜前表面散光度数及轴向;用日本TOPCON公司的RM8000自动电脑验光仪进行散瞳验光,获取眼球散光度数和轴向。结果:眼球散光与角膜前表面散光的比值为0.811±0.665;眼球散光<0.50D者150眼,散光度数差异、散光轴向差异均有统计学意义;散光度数、散光轴向均正相关;0.50D≤眼球散光<1.00D者122眼,散光度数差异有统计学意义;轴向差异无统计学意义;散光度数无相关性,散光轴向正相关;眼球散光≥1.00D者86眼,散光度数差异无统计学意义;散光轴向差异有统计学意义;散光度数、散光轴向均正相关。结论:角膜后表面及晶状体对角膜前表面散光有一定的补偿作用;角膜前表面散光与眼球散光正相关,散光度数越高,相关程度越高;角膜屈光手术根据眼球散光进行手术设计可能较好,屈光性晶状体置换术及白内障手术可根据角膜前表面散光确定手术切口位置。

·AIM:To research the relationship between the astigmatism of anterior corneal surface and overall astigmatism,and provide the reference for the refractive surgery design.·METHODS:Totally 358 eyes were enrolled.The astigmatic degree and axis of anterior corneal surface were obtained by the corneal surface topography examination with an topographer(TMS-4,TOMEY company,Japan);the degree and axis of the overall astigmatism were from cycloplegic refraction by an automatic refractor(RM8 000,TOPCON company,Japan).·RESULTS:The ratio of the overall astigmatism and the astigmatism of anterior corneal surface was 0.811±0.665.In 150 eyes with overall astigmatism less than 0.50D,the differences of astigmatic degree and axis between two astigmatisms were significant respectively;there was positive correlation in astigmatic degree and axis.In 122 eyes with overall astigmatism between 0.50D and 1.00D,significant difference was found in astigmatic degree but not in axis between two astigmatisms.There was no correlation in astigmatic degree and positive correlation in astigmatic axis.86 eyes with overall astigmatism more than 1.00D,significant difference was found in astigmatic axis but not in degree;There were positive correlation in astigmatic degree and axis.·CONCLUSION:The posterior corneal surface and crystalline compensate for the astigmatim of anterior corneal surface.The astigmatism of anterior corneal surface is positively correlated with the overall astigmatism.The higher the astigmatic degree,the higher the correlation.Corneal refractive surgery may be designed better according to the overall astigmatism.The incision location in refractive lens exchange and cataract surgery is determined by the astigmatism of anterior corneal surface.·

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