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To assess the accuracy of 5 different intraocular lens (IOL) power formulas (Barrett Universal II, Haigis, Ladas Super Formula, Holladay1, and SRK/T) using IOLMaster biometry in eyes with long axial length (AXL).
Retrospective case series. A total of 72 eyes with an axial length of >25.2 mm from 72 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 5 different formulas was calculated and compared with postoperative refractive outcome to give the prediction error.
There was no statistically significant difference in the mean absolute prediction error (MAE) between the 5 different formulas for IOL power calculation (p=0.127, ANOVA) but the Barrett Universal II formula resulted least MAE. The Ladas Super Formula had the second lowest MAE followed by the Haigis formula. The Holladay1 had the highest MAE of the 5 methods assessed. The Haigis formula yielded the highest percentage of eyes within ±0.5 D and ±1.0 D of the target refraction in this study (79.17% and 97.22%, respectively).
Overall, the Barrett Universal II formula had the lowest prediction error in long eyes, however, there was no superiority in refractive outcome prediction between the 5 IOL formulas.