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Belov D.F.

Saint Petersburg Multifield Hospital No. 2;
Saint Petersburg State University

Danilenko E.V.

S.M. Kirov Medical Military Academy

Nikolaenko V.P.

Saint Petersburg Multifield Hospital No. 2;
Saint Petersburg State University

Potemkin V.V.

Saint Petersburg Multifield Hospital No. 2;
Pavlov First Saint Petersburg State Medical University

Evaluation of the accuracy of modern intraocular lens calculation formulas when optical biometry is not possible

Authors:

Belov D.F., Danilenko E.V., Nikolaenko V.P., Potemkin V.V.

More about the authors

Journal: Russian Annals of Ophthalmology. 2024;140(2): 34‑39

DOI: 10.17116/oftalma202414002134

Read: 1465 times

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Table of contents

EVALUATION OF THE ACCURACY OF MODERN INTRAOCULAR LENS CALCULATION FORMULAS WHEN OPTICAL BIOMETRY IS NOT POSSIBLE
EVALUATION OF THE ACCURACY OF MODERN INTRAOCULAR LENS CALCULATION FORMULAS WHEN OPTICAL BIOMETRY IS NOT POSSIBLE

To cite this article:

Belov DF, Danilenko EV, Nikolaenko VP, Potemkin VV. Evaluation of the accuracy of modern intraocular lens calculation formulas when optical biometry is not possible. Russian Annals of Ophthalmology. 2024;140(2):34‑39. (In Russ.)
https://doi.org/10.17116/oftalma202414002134

Подписка 2026 Вестник офтальмологии (Russian Annals of Ophthalmology)
МСФ на ЯМ
Использование инфографики авторами научных работ
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Abstract:

PURPOSE

This study evaluates the accuracy of modern intraocular lens (IOL) calculation formulas using axial length (AL) data obtained by ultrasound biometry (UBM) compared to the third-generation SRK/T calculator.

MATERIAL AND METHODS

The study included 230 patients (267 eyes) with severe lens opacities that prevented optical biometry, who underwent phacoemulsification (PE) with IOL implantation. IOL power calculation according to the SRK/T formula was based on AL and anterior chamber depth obtained by UBM (Tomey Biometer Al-100) and keratometry on the Topcon KR 8800 autorefractometer. To adapt AL for new generation calculators — Barrett Universal II (BUII), Hill RBF ver. 3.0 (RBF), Kane and Ladas Super Formula (LSF) — the retinal thickness (0.20 mm) was added to the axial length determined by UBM, and then the optical power of the artificial lens was calculated. The mean error and its modulus value were used as criteria for the accuracy of IOL calculation.

RESULTS

A significant difference (p=0.008) in the mean IOL calculation error was found between the formulas. Pairwise analysis revealed differences between SRK/T (–0.32±0.58 D) and other formulas — BUII (–0.16±0.52 D; p=0.014), RBF (–0.17±0.51 D; p=0.024), Kane (–0.17±0.52 D; p=0.029), but not with the LSF calculator (–0.19±0.53 D; p=0.071). No significant differences between the formulas were found in terms of mean error modulus (p=0.238). New generation calculators showed a more frequent success in hitting target refraction (within ±1.00 D in more than 95% of cases) than the SRK/T formula (86%).

CONCLUSION

The proposed method of adding 0.20 mm to the AL determined by UBM allows using this parameter in modern IOL calculation formulas and improving the refractive results of PE, especially in eyes with non-standard anterior segment structure.

Keywords:

mature cataract
intumescent cataract
posterior capsular cataract
ultrasound biometry
optical biometry
IOL calculation
Barrett Universal II Formula
Hill RBF
Kane
Ladas Super Formula
phacoemulsification

Authors:

Belov D.F.

Saint Petersburg Multifield Hospital No. 2;
Saint Petersburg State University

Danilenko E.V.

S.M. Kirov Medical Military Academy

Nikolaenko V.P.

Saint Petersburg Multifield Hospital No. 2;
Saint Petersburg State University

Potemkin V.V.

Saint Petersburg Multifield Hospital No. 2;
Pavlov First Saint Petersburg State Medical University

Received:

11.10.2022

Accepted:

25.12.2022

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