ArticleBMC ophthalmology2020
Influence of pupil dilation on the Barrett universal II (new generation), Haigis (4th generation), and SRK/T (3rd generation) intraocular lens calculation formulas: a retrospective study.
Article in BMC ophthalmology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.
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17 citing papers in PubMed.
- Comparative Analysis of Twenty Intraocular Lens Power Calculation Formulas in Medium-Long Eyes.Diagnostics (Basel, Switzerland) · 2026Article
- Impact of pupil dilation on IOL power calculation based on biometric measurements with Heidelberg Anterion.Documenta ophthalmologica. Advances in ophthalmology · 2026Article
- Effect of pupillary dilation on ocular biometry and intraocular lens power calculation: prospective cohort study.Journal of cataract and refractive surgery · 2026Article
- Effect of pupil dilation on spherical and toric IOL calculations using a swept source OCT ocular biometer.International ophthalmology · 2026Observational
- The influence of pupil dilation on ocular parameters and its impact on various intraocular lens power calculation formulas.Indian journal of ophthalmology · 2026Article
- Mathematical Modeling of IOL Power Changes After Pupil Dilation Based on Multifactorial Analysis.Journal of ophthalmology · 2026Article
- Prediction of Seven Artificial Intelligence-Based Intraocular Lens Power Calculation Formulas in Medium-Long Caucasian Eyes.Life (Basel, Switzerland) · 2025Article
- Accuracy of 20 Intraocular Lens Power Calculation Formulas in Medium-Long Eyes.Ophthalmology and therapy · 2024Article
- Association of Patient Satisfaction with Cataract Grading in Five Types of Multifocal IOLs.Advances in therapy · 2024Article
- Comparison of ocular biometry and refractive outcomes using two swept-source optical coherence tomography-based biometers.PloS one · 2024Article
- Influence of Pilocarpine Eyedrops on the Ocular Biometric Parameters and Intraocular Lens Power Calculation.Journal of ophthalmology · 2023Article
- Effectiveness, Sensitivity, and Specificity of Intraocular Lens Power Calculation Formulas for Short Eyes.Turkish journal of ophthalmology · 2022Article
- Evaluation of the White-to-White Distance in 39,986 Chinese Cataractous Eyes.Investigative ophthalmology & visual science · 2021Article
- Visual performance of four types of diffractive multifocal intraocular lenses and a review of articles.International journal of ophthalmology · 2021Article
- Evaluation of residual refractive prediction accuracy after phacoemulsification using the SRK/T formula.Saudi journal of ophthalmology : official journal of the Saudi Ophthalmological SocietyArticle
- Analysis of accuracy of twelve intraocular lens power calculation formulas for eyes with axial hyperopia.Saudi journal of ophthalmology : official journal of the Saudi Ophthalmological SocietyArticle
- Analysis of accuracy of twelve intraocular lens power calculation formulas for eyes with axial myopia.Taiwan journal of ophthalmologyArticle
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3 authors.
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Abstract
backgroundDespite the surge in the number of cataract surgeries, there is limited information available regarding the influence of pupil dilation on predicted postoperative refraction and its comparison with recommended various intraocular lens power calculated using the different parameters. We used three different IOL power calculation formulas: Barrett Universal II (Barrett) (5-variable formula), Haigis (3-variable formula), and SRK/T (2-variable formula), in order to investigate the potential effect of pupil dilation on the predicted postoperative refraction (PPR) and recommended intraocular lens (IOL) power calculation.
methodsThis retrospective study included 150 eyes. All variables were measured and calculated using a ZEISS IOL Master 700. The following variables were measured before and after dilation: anterior chamber depth (ACD), lens thickness (LT), white-to-white (WTW). PPR and recommended IOL power were calculated by Barrett, Haigis, and SRK/T IOL calculation formulas. The change in each variable before and after dilation, and the correlations between all changes were analyzed using the Wilcoxon signed-rank test and the Spearman's rank-order correlation test, respectively.
resultsThe mean absolute change (MAC) in PPR before and after dilation was found to be highest in the Barrett formula. Significant differences were found between each MAC (P < 0.0001). Significant changes were observed before and after dilation in ACD and LT (P < 0.0001), but not in WTW. Using the Barrett and Haigis formulas, there was a significant positive correlation between the change in PPR and change in ACD (P < 0.0001), and a negative correlation between change in PPR and change in LT (P < 0.0001). The correlations were strongest with the Barret formula followed by the Haigis, particularly in terms of LT. Changes in PPR determined by the Barrett formula also demonstrated a significant positive correlation with changes in WTW (P = 0.022). The recommended IOL power determined using Barrett and Haigis changed before and after dilation in 23.3 and 19.3% cases respectively, while SRK/T showed no change.
conclusionsIn terms of PPR and recommended IOL power, pupil dilation influenced mostly the Barrett formula. Given the stronger correlation between the changes in PPR when using Barrett and the changes in ACD, LT, and WTW, changes in ACD, LT, and WTW significantly affect how dilation influences the Barrett formula. Determining how dilation influences each formula and other variables is key to improving the accuracy of IOL calculations.
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