Comparison of the Sanders–Retzlaff–Kraff II and Barrett Universal II Intraocular Lens Formula in eyes with normal axial lengths

Abstract

Introduction: This study evaluates the difference between two intraocular lens (IOL) power calculation formulas in post-phacoemulsification surgery patients with the axial length (AXL) ranging from 22.00 to 24.50 mm.

Aim: This study aimed to know the accuracy and the relevancy of Sanders–Retzlaff–Kraff (SRK) II IOL formula compared with Barret Universal II IOL formula to minimize the refractive prediction error (RPE) Value in eyes with normal AXL.

Methods: This retrospective study reviews the medical records of 35 patients who had cataract surgery. The differences of RPE value in SRK II and Barrett Universal II IOL formula were analyzed using repeated-measures analysis of variance.

Results: There is no statistically significant difference in the RPE value between the two IOL formulas. Each formula has the standard deviation of RPE value ±0.50 D in 62.8% of patients and ±1.00 D in 94.3% to 97.1% of patients. Conclusion: The RPE distribution range in both formulas in eyes with normal AXL was within the benchmark standard of The United Kingdom National Health Service. SRK II formula can be preferred in a high backlog country.