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Year : 2021  |  Volume : 16  |  Issue : 1  |  Page : 5-10

A comparative study on the accuracy of SRK/T, holladay II, and barrett universal II formulas in intraocular lens power calculation of axial myopes undergoing cataract surgery

Department of Ophthalmology, Jawaharlal Nehru Medical College, Datta Meghe Institute of Medical Sciences (Deemed to be University), Wardha, Maharashtra, India

Correspondence Address:
Dr. Ritica Mukherji
T-28 Shalinata P.G Girls Hostel, Datta Meghe Institute of Medical Sciences, Sawangi (M), Wardha - 442 001, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jdmimsu.jdmimsu_374_20

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Context: Calculation of intraocular lens (IOL) power for extremes of axial lengths (ALs), using classical formulae like Sanders-Retzlaff-Kraff/Theoretical (SRK/T), is unsatisfactory. With the advent of fourth-generation formulae, surgeons are now aiming for better refractive outcomes for such patients postcataract extraction. Aims: The aim of this study was to assess and compare the accuracy of SRK/T, Holladay II, and Barrett Universal II formulae for IOL power calculation in high myopes with cataract by computing the mean absolute error (MAE). Settings and Design: This was a hospital-based prospective comparative study conducted over a period of 1 year. Forty patients with AL ≥26 mm undergoing cataract extraction were included after taking inclusion and exclusion criteria into consideration. Subjects and Methods: After enrolling patients and obtaining informed consent, all patients underwent a comprehensive ophthalmic examination. The power of IOL to be implanted was calculated by SRK/T, Holladay II, and Barrett Universal II with the goal of achieving refraction within ± 1 D postoperatively. Phacoemulsification was performed for all patients and hydrophilic foldable IOLs were implanted. Patients were followed up for 2 months at the end of which MAE was calculated for all three formulae. Statistical Analysis: Statistical analysis was done by descriptive and inferential statistics using Kruskal–Wallis Chi-square test and Mann–Whitney U-test. Software used in the analysis was SPSS 24 version and P < 0.5 was considered as the level of significance. Results: Barrett Universal II formula had the lowest MAE with a mean of 0.06 ± 0.20 and a median absolute error of 0.02. This was followed by Holladay II and SRK/T. While Barrett Universal II outperformed for all powers of IOL, SRK/T had lower MAE for plus power IOLs and Holladay II was better for negative-power IOLs. Conclusions: Barrett Universal II formula is ideal for IOL power calculation in cataract patients with AL >26 mm.

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