Abstract
Purpose
To assess the accuracy of intraocular lens power calculation formulas Barrett Universal II (BUII), Hill-Radial Basis Function (RBF) 3.0, Kane, Ladas Super Formula (LSF), Haigis, Hoffer Q, and SRK/T in primary angle-closure disease (PACD).
Methods
A total of 129 PACD eyes were enrolled. Prediction refraction was calculated for each formula and compared with actual refraction. Accuracy was determined by formula performance index (FPI), median absolute error (MedAE) and percentage of eyes with a prediction error (PE) within ± 0.50D. Subgroup analysis was performed according to axial length (AL).
Results
Overall, FPI was ranked as follows: Kane (0.067), RBF 3.0 (0.064), Haigis (0.062), SRK/T (0.060), BUII (0.058), Hoffer Q (0.055), and LSF (0.049). Kane got the highest (71.3%) percentage of eyes with PE within ± 0.50 D. In medium AL eyes (22 mm < AL ≤ 25 mm), FPI ranked the same as in total group. MedAEs were equal across all formulas (P = 0.121). In short eyes (AL ≤ 22 mm), FPI was Kane (0.055), RBF 3.0 (0.050), SRK/T (0.050), Haigis (0.049), BUII (0.047), Hoffer Q (0.045), and LSF (0.033). MedAEs were significantly different across all formulas (P = 0.033). Haigis showed the lowest MedAE (0.35 D), Haigis and Kane got the highest percentage (63.6%) of eyes with PE within ± 0.50 D.
Conclusion
Kane outperformed in total PACD eyes; RBF 3.0, Haigis, and SRK/T achieved satisfying performance. When dealing with PACD eyes shorter than 22 mm, Kane achieved the best accuracy. RBF 3.0, SRK/T, Haigis, and BUII achieved comparable outcomes. No formula showed superiority over others for medium AL PACD eyes.
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Data availability
The data used to support the findings of this study are available from the corresponding author upon reasonable request.
Code availability
Not applicable.
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Funding
This study was financially supported by a grant from the National Key Research and Development Program of China (No. 2017YFC1104603).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Min Hou and Yujie Ding. The first draft of the manuscript was written by Min Hou, and all authors commented on the previous versions of the manuscript. All authors read and approved the final manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This retrospective study was approved by the Institutional Review Board of Zhongshan Ophthalmic Center, Sun Yat-Sen University (No.2019KYPJ124).
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Other cited materials
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Hou, M., Ding, Y., Liu, L. et al. Accuracy of intraocular lens power calculation in primary angle-closure disease: comparison of 7 formulas. Graefes Arch Clin Exp Ophthalmol 259, 3739–3747 (2021). https://doi.org/10.1007/s00417-021-05295-w
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DOI: https://doi.org/10.1007/s00417-021-05295-w