Pentacam系统K值在角膜正常的白内障患者人工晶状体屈光力计算中的研究OA

Objective To evaluate keratometry(K)readings obtained with Pentacam and intraocular lenses(IOL)Master in eyes scheduled for cataract surgery,and to compare the predicted and actual refractive outcomes.Methods Pro-spective study.52 eyes of 38 cataract patients having phacoemulsification and in-the-bag IOL implantation were studied.Before the operation,Pentacam and IOL Master were used to measure corneal refractive power,respectively.And the col-lected data included:Sim K,equivalent K reading(EKR)at 1.0 to 7.0 mm of corneal diameters,True net power(TNP)were measured by Pentacam system and Km measured by IOL master.The IOL power was calculated using 4 formulas.Sta-tistical analysis of refractive outcomes was performed.Results The Km gave the lowest mean absolute error(MAE)with all formulas.The second lowest MAE was the Sim K by the Pentacam.The highest MAE was the Scheimpflug equivalent K at 7.0 mm.Among the equivalent K at 1.0～7.0 mm corneal diameters,equivalent K at 3.0 mm gave the lowest MAE.Con-clusions In cataract patients with normal corneal morphology,the K value measured by Pentacam can not improve the ac-curacy of IOL refractive power calculation compared with Km value measured by IOL Master.