· AIM:To analyse the influence of correcting corneal astigmatism on the accuracy of intraocular lens power prediction after cataract surgery.· METHODS:Thirty-five cases of age-related cataract 35 eyes were selected,the corneal astigmatism was reduced after phacoemulsification with superior incision and PMMA intraocular lens implantation.The keratometry was measured before operation and three months postoperatively,then the absolute forecast error of SRK Ⅱ,SRK/T,Holladay Ⅰ formula with preoperative and postoperative corneal curvature were compared.·RESULTS:The average corneal curvature was increased by 0.30±0.81D(t=-2.205,P<0.05),the corneal astigmatism was decreased by 0.70±0.71D after operation(t=5.846,P<0.01),there was correlation between them(r=-0.554,P<0.01).The absolute predict errors of SRKⅡ,SRK/T and Holladay Ⅰ formulas using preoperative curvature was respectively 0.85D,0.73D and 0.78D,there was no significant difference(χ2=4.474,P>0.05).The absolute predict error using postoperative curvature was respectively 0.72D,0.54D and 0.46D,SRKⅡ indicated statistical difference from other formulas(χ2=7.758,P<0.05).The third theoretical formula had statistical difference from using preoperative and postoperative curvature(Z=-2.208,-2.273,P<0.05).· CONCLUSION:Correcting the corneal astigmatism may cause the changes in corneal refraction,which leads to the error of the intraocular lens prediction increase,especially the accuracy of the third generation formula decrease,so it is necessary to adjust and optimize the formula accordingly.·