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Comparison of intraoperative aberrometry, Koch-Wang, Olsen and Barrett Universal II formulae for intraocular lens calculation in eyes with axial lengths above 25.0 mm

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Session Details

Session Title: Cataract Surgery Outcomes. IOL Power Calculations

Session Date/Time: Monday 07/09/2015 | 16:30-18:30

Paper Time: 17:28

Venue: Room 1

First Author: : S.Masket USA

Co Author(s): :    N. Fram   L. Wang                 

Abstract Details


To evaluate accuracy of intraoperative aberrometry proprietary nomogram as compared to the Koch-Wang, Olsen, and Barrett Universal II Formulae in predicting intraocular lens power in eyes with axial lengths above 25.0 mm.


Advanced Vision Care, Private Practice, Los Angeles, CA, USA


Retrospective review of 52 eyes of 32 patients undergoing cataract surgery between 2013-2014 with a single platform intraocular lens (Acrysof, Alcon) and axial lengths greater than 25.0 mm. Intraoperative aberrometry (ORA, WaveTec), Holladay-1 adjusted Koch-Wang formula, Olson Formula, and Barrett Universal II Formula were compared. Consecutive eyes with axial lengths >25.0 mm undergoing cataract surgery with intraocular lens implantation were included in the study. Eyes with prior history of laser vision correction, pre-existing corneal pathology, macular disease or staphylomas or were excluded from the study. Main outcome measures included mean absolute error and median absolute error.


Mean absolute error was 0.15 for intraoperative aberrometry, 0.25 for the Koch-Wang formula, 0.21 for the Olson formula and 0.19 for the Barrett Universal II formula. Median absolute error was 0.09 for intraoperative aberrometry, 0.12 for the Koch-Wang formula, 0.10 for the Olsen Formula and 0.12 for the Barrett Universal II Formula. Statistical significance between groups was not achieved.


Intraoperative aberrometry appears to be comparable to the Koch-Wang, Olsen and Barrett Universal II Formulae to accurately predict intraocular lens power in eyes with axial lengths >25.0 mm.

Financial Interest:


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