Abstract
Purpose: To compare post-operative mean refractive error with SandersRetzlaff-Kraff/theoretical (SRK-T) and Holladay 1 formulae for intraocular lens
(IOL) power calculation in cataract patients with longer axial lengths.
Study Design: Randomized controlled trial.
Place and Duration of Study: Department of Ophthalmology, Shaikh Zayed
Hospital Lahore from 01 January 2017 01 January, 2018.
Material and Methods: A total of 80 patients were selected from Ophthalmology
Outdoor of Shaikh Zayed Hospital Lahore. The patients were randomly divided
into two groups of 40 each by lottery method. IOL power calculation was done in
group A using SRK-T formula and in group B using Holladay1 formula after
keratomery and A-scan. All patients underwent phacoemulsification with foldable
lens implantation. Post-operative refractive error was measured after one month
and mean error was calculated and compared between the two groups.
Results: Eighty cases were included in the study with a mean age of 55.8 ± 6.2
years. The mean axial length was 25.63 ± 0.78mm, and the mean keratometric
power was 43.68 ± 1.1 D. The mean post-operative refractive error in group A
(SRK/T) was +0.36D ± 0.33D and in group B (Holladay 1) it was +0.68 ± 0.43.
The Mean Error in group A was +0.37D ± 0.31D as compared to +0.69D ± 0.44D
in group B.
Conclusion: SRK/T formula is superior to Holladay 1 formula for cases having
longer axial lengths.
Sidra Anwar, Atif Mansoor Ahmad, Irum Abbas, Zyeima Arif. (2019) Post Cataract Surgery Refractive Error in Myopic Patients Using SRK/T Versus Holladay 1 Formula for IOL Power Calculation, Pakistan Journal of Ophthalmology, Volume 35, Issue 2.
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