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Simulation of toric intraocular lens implantation results: comparison between different keratometers using the Baylor toric IOL nomogram

Session Details

Session Title: Biometry

Session Date/Time: Tuesday 08/10/2013 | 08:00-10:30

Paper Time: 08:41

Venue: Elicium 2 (First Floor)

First Author: : A.Abulafia AUSTRALIA

Co Author(s): :    S. Ofir   G. Kleinmann   A. Levy   O. Reitblat   Y. Ton   E.

Abstract Details


To compare the simulated clinical outcomes in patients with Toric intraocular lenses (IOLs) calculated using manual keratometry, automated keratometry, dual-zone automated keratometry and corneal topography; and to evaluate the simulated clinical impact of the Baylor Toric IOL Nomogram for each device.


Ein-Tal Eye center, Tel Aviv, Israel.


Records of patient who had toric IOL implantation during cataract surgery were reviewed to identify those who had pre and post operative anterior corneal measearment using manual keratometer, IOL Master 500, Lenstar LS 900 and ATLAS corneal Topographer. Preoperative astigmatic measurements of each device were used for calculations of the optimal toric IOL power and axis with and without the Baylor Toric IOL Nomogram. A vector analysis was used for calculating the post-operative true net total eye astigmatic power and the simulated residual astigmatism for each measuring device.


65 eyes (49 patients) were enrolled. The mean arithmetic simulated residual astigmatism was 0.68±0.4 (Lenstar), 0.71±0.31 (IOL-Master), 0.69±0.39 (JAVAL), 0.86±0.51 (ATLAS Sim K’s) and 0.81±0.37 (ATLAS mean K’s). The mean centroid simulated residual astigmatism was 0.52@85 (Lenstar), 0.47@85 (IOL-Master), 0.44@80 (JAVAL), 0.43@82 (ATLAS Sim K’s), 0.54@81 (ATLAS mean K’s). Using the Baylor’s Toric IOL Nomogram, all devices had achieved a mean centroid with the rule simulated residual astigmatism of 0.15 to 0.24D.


Manual keratometry, automated keratometry, dual-zone automated keratometry and corneal topography showed similar simulated clinical outcomes for Toric IOLs Calculations. Toric-IOL calculations using all the devices led to against the rule simulated residual astigmatism. Calculations with the Baylor Toric IOL Nomogram resulted in a desired with the rule simulated residual astigmatism.

Financial Interest:


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