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IOL calculation comparison of refractive lens exchange in eyes with axial lengths shorter than 22.5 mm

Poster Details

First Author: R.Lapid-Gortzak THE NETHERLANDS

Co Author(s):    J. van der Linden   I. van der Meulen   V. Vrijman   G. Barrett           

Abstract Details


To compare the predictive value of different IOL calculating formulae to the Barrett Universal II formula.


Retina Total Eye Care, Driebergen, and AMC dept of ophthalmology, University of Amsterdam, Holland


In a cohort of 104 eyes implanted with SN6AD1/3 and toric versions, a postoperative comparison was made between the different formulae for IOL calculation: Haigis, Holladay I, Hoffer Q and SRK-T, and compared to the Barrett Universal II (BUII). All eyes with an axial length shorter than 22.5 mm were included. All eyes with incomplete datasets, other use of IOL platforms, or previous refractive surgery were excluded. Biometry, visual, and refractive data were also analyzed.


In 105 eyes, the mean absolute error (MAE) was calculated for the different formulae: SRK-T: 0.38 D + 0.33 SD, the Haigis: 0.30 + 0.25, Holladay: 0.32 + 0.27, Hoffer Q: 0.32 + 0.27, and the Barrett Universal II (BUII) 0.29 + 0.24. The percentages between + 0.5D, and + 1.0D were 75.61%, and 92.68 for the SRK/T formula. For the Haigis this was 79.27%, and 98.78%. For the Holladay these percentages were 78.05%,and 97.56%. The Hoffer Q: 74.39%, 97.56%. For the Barrett Universal II formula these percentages were 84.15% , and 98.78%.


The use of the BUII formula may enhance predictability and patient outcome. The Haigis formula gave the second best result, while the Holladay and Hoffer Q formulae were slightly worse. The SRK-T seems to be the least reliable formula for calculation of IOL power in short eyes.

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