Abstract
There are an increasing number of people who have had refractive surgery now developing cataract. To compare the accuracy of different intraocular lens (IOL) power calculation formulas after laser refractive surgery (photorefractive keratectomy or laser in situ keratomileusis), a comprehensive literature search of PubMed and EMBASE was conducted to identify comparative cohort studies and case series comparing different formulas: Haigis-L, Shammas-PL, SRK/T, Holladay 1 and Hoffer Q. Seven cohort studies and three observational studies including 260 eyes were identified. There were significant differences when Hoffer Q formula compared with SRK/T, Holladay 1. Holladay 1 formula produced less prediction error than SRK/T formula in double-K method. Hoffer Q formula performed best among SRK/T and Holladay 1 formulas in total and single-K method. In eyes with previous data, it is recommended to choose double-K formula except SRK/T formula. In eyes with no previous data, Haigis-L formula is recommended if available, if the fourth formula is unavailable, single-k Hoffer Q is a good choice.
Highlights
According to the latest assessment, cataracts account for 51% of the world’s blindness, that is about 20 million people
The second-generation formula are the regression formula SRKII formula that introduced after the improvement of SRK I formula and the Binkhorst II formula based on the correction of the axial axis and the anterior chamber depth (ACD)[10]
3936 records were excluded because of irrelevance or retrospective research. 48 articles were read full text and assessed. 22 of them had the irrelevant data to our outcomes of interest, 12 of them were excluded because of only one target intraocular lens (IOL) calculation formula and the formulas in 2 studies were not included
Summary
According to the latest assessment, cataracts account for 51% of the world’s blindness, that is about 20 million people. Residual postoperative refractive error can be common, especially in patients who undergone refractive corneal surgery before and are developing cataracts[3,4,5,6]. Holladay et al.[11] introduced the corneal curvature into the ACD calculation formula. Patients undergoing refractive surgery usually have higher requirements for vision They hope to get perfect visual acuity after cataract surgery, so the surgeon needs to find proper formula to ensure the accuracy of the intraocular lens power calculation. For this subset of patients, a meta-analysis comparing different formulas to calculate IOL power was performed
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