الفهرس 
Title : Evaluation of Barrett Universal II formula for intra-ocular lens power calculation in high myopic patients using optical biometry
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Abstract
Patients & Methods: This study reviewed 34 eyes of 34 high myopic patients, with axial length {u2265} 26.0 mm, who underwent uneventful phacoemulsification with implantation of the same one piece IOL in the bag aiming for -1 diopter postoperative refraction after 1 month. The refractive prediction error was calculated for IOL power calculation formulae SRK/T, Haigis, and Barrett Universal II (Barrett U2) by subtracting the predicted refraction from the actual refraction postoperatively. The mean numerical error (MNE), the percentage of eyes with hyperopic outcomes, and median absolute error (MedAE) were determined for each formula and compared. Results: The Barrett U2 produced the lowest MNE (-0.11 D) close to zero and lowering the percentage to 44.1 % of eyes would have hyperopic outcomes. Furthermore, Barrett U2 had the lowest MedAE (0.15 D; MAE of 0.45) followed by Haigis and SRK/T (0.40; MAE of 0.64 and 0.47; MAE of 0.63 respectively). There was a significant difference between Barrett U2 and the two other formulae even when compared separately. There was no significant difference between Haigis and SRK/T when compared.The Barrett U2 formula met the benchmark criteria for postoperative refraction results as the percentage of eyes within ±0.50 D was 82.4 % which was statistically significantly higher than the other two formulae