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Accuracy of different formulas for multifocal intraocular lens power prediction after corneal refractive laser surgery for myopia

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Session Details

Session Title: Pseudophakic IOL Power Calculation: Photic Phenomena after IOL Implantation

Session Date/Time: Sunday 08/10/2017 | 16:30-18:00

Paper Time: 16:30

Venue: Room 3.4

First Author: : V.Vrijman THE NETHERLANDS

Co Author(s): :    A. Abulafia   R. Lapid-Gortzak                 

Abstract Details


To compare the accuracy of different intraocular lens (IOL) calculation formulas available on the American Society of Cataract and Refractive Surgery (ASCRS) post-refractive surgery IOL power calculator for the prediction of IOL power after previous corneal refractive laser surgery for myopia.


Academic Medical Center, University of Amsterdam, Amsterdam, and Retina Total Eye Care, Driebergen, the Netherlands.


Patients who previously had laser in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK) for myopia and subsequently had uneventful cataract surgery with a multifocal IOL (SN6AD1 or SN6AD3) implantation, were included in this study. The accuracy of the Masket, Modified Masket, Barrett True-K, Shammas, Haigis-L and Barrett True-K no History formulas and the average of all formulas was analyzed and compared with each other, using the surgeon personalized IOL constants.


Sixty-four eyes were available for analysis. All formulas, expect for the Masket and the Barrett True-K, had a mean numerical error (MNE) which was significant different from zero (P<0.001). The Masket and Barrett True-K formulas had the lowest MNE (-0.07D and -0.13D, respectively, P<0.001). The Shammas and the Haigis-L formulas had the highest median absolute prediction errors (0.54D and 0.46D, respectively, P≤0.02) and the lowest proportion of eyes within ±0.50D from the predicted refraction (48.4% and 54.7%, respectively).


In our dataset, using personalized lens constants derived for normal population, the Masket and the Barrett True-K formulas had the most favorable prediction outcomes, while the Shammas and the Haigis-L formula had the least favorable prediction outcomes in eyes with previous LASIK or PRK for myopia.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a competing company

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