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A predictability comparison of 4 different IOL power calculation formulas in eyes of long axial length

Poster Details

First Author: Y.Jung SOUTH KOREA

Co Author(s):    Y. Han   J. Choi                 

Abstract Details


To assess the accuracy of 4 different intraocular lens (IOL) power formulas (Barrett Universal II, Haigis, Ladas Super Formula, and SRK/T) using IOLMaster biometry in eyes with long axial length (AXL).


1. Department of Ophthalmology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center. 2. Department of Ophthalmology, Jeju National University Hospital


A total of 122 eyes with an axial length of >25.2 mm from 122 patients who had uneventful cataract surgeries with implantation of Akreos Adapt AO IOL at a tertiary care center by single experienced surgeon were included. Optical biometer of IOLMaster was used. The predicted refractive outcome using each of 4 different formulas was calculated and compared with postoperative refractive outcome to give the prediction error.


There was a statistically significant difference in the mean absolute prediction error (MAE) between the 4 different formulas for IOL power calculation (p=0.014) and the Barrett Universal II formula predicted most accurate outcome. The Ladas Super Formula had the second lowest MAE followed by the Haigis formula. The SRK/T had the highest MAE of the 4 methods assessed. The Barrett Universal II formulas yielded the highest percentage of eyes within ±1.0 D and ±0.5 D of the target refraction in this study (91.51% and 73.26%, respectively).


The Barrett Universal II formulas showed most accurate IOL power prediction in patients with long axial length.

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