Effect of different methods of corneal curvature measurement on postoperative corneal astigmatism correction after implantation of TORIC artificial lens / 重庆医学

ABSTRACT

Objective To observe how different measuring methods of corneal curvature produce affect postoperative corneal a-stigmatism correction after implantation of TORIC artificial lens .Methods To measure 4 teams of age-related cataract patients complicated with regular astigmatism of more than 1 .0D by the procedure of manual keratometer ,IOL Master ,auto keratometer and Pentacam respectively .The Toric artificial lenses were precisely placed in appropriate position in phacoemulsification surgery .We observed the uncorrected visual acuity (UCVA) ,best corrected visual acuity (BCVA) in 1D ,1W ,1M ,3M before and after the sur-gery ,corneal astigmatism after the surgery ,as well as anticipated and consequent residual astigmatism .Results The variance analy-sis of absolute-value deviation between anticipated residual astigmatism (ARA) and best corrected visual acuity (BCVA) is P<0 .0001 ,the above difference was statistically significant ;we consider that the astigmatic deviation measured by the four methods is different ;besides the deviation of paired comparison results between Master-team (0 .322) and auto-team (0 .242) ,auto-team and manual-team (0 .218) ,manual-team and Pentacam-team(0 .107) is more than 0 .05 and not statistically significant ,all the remaining paired comparison results are statistically significant ,(P<0 .05) ,the Pentacam-team (0 .082) is the minimum deviation ,while the IOL Master-team (0 .422) is the maximum one .Conclusion The measuring result to estimate the exact value of Acrysof Toric IOL by Pentacam is more accurate than by other methods .