Intraocular Lens power calculation after laser refractive surgery: A Meta-Analysis

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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.

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Comparison of immersion ultrasound biometry and partial coherence interferometry for intraocular lens calculation according to Haigis.

W Haigis, B. Schneider, B Lege … (2000)

The precision of intraocular lens (IOL) calculation is essentially determined by the accuracy of the measurement of axial length. In addition to classical ultrasound biometry, partial coherence interferometry serves as a new optical method for axial length determination. A functional prototype from Carl Zeiss Jena implementing this principle was compared with immersion ultrasound biometry in our laboratory. In 108 patients attending the biometry laboratory for planning of cataract surgery, axial lengths were additionally measured optically. Whereas surgical decisions were based on ultrasound data, we used postoperative refraction measurements to calculate retrospectively what results would have been obtained if optical axial length data had been used for IOL calculation. For the translation of optical to geometrical lengths, five different conversion formulas were used, among them the relation which is built into the Zeiss IOL-Master. IOL calculation was carried out according to Haigis with and without optimization of constants. On the basis of ultrasound immersion data from our Grieshaber Biometric System (GBS), postoperative refraction after implantation of a Rayner IOL type 755 U was predicted correctly within +/- 1 D in 85.7% and within +/- 2 D in 99% of all cases. An analogous result was achieved with optical axial length data after suitable transformation of optical path lengths into geometrical distances. Partial coherence interferometry is a noncontact, user- and patient-friendly method for axial length determination and IOL planning with an accuracy comparable to that of high-precision immersion ultrasound.

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The Hoffer Q formula: a comparison of theoretic and regression formulas.

Barry Hoffer (1993)

A new formula, the Hoffer Q, was developed to predict the pseudophakic anterior chamber depth (ACD) for theoretic intraocular lens (IOL) power formulas. It relies on a personalized ACD, axial length, and corneal curvature. In 180 eyes, the Q formula proved more accurate than those using a constant ACD (P < .0001) and equal (P = .63) to those using the actual postoperative measured ACD (which is not possible clinically). In 450 eyes of one style IOL implanted by one surgeon, the Hoffer Q formula was equal to the Holladay (P = .65) and SRK/T (P = .63) and more accurate than the SRK (P < .0001) and SRK II (P = .004) regression formulas using optimized personalization constants. The Hoffer Q formula may be clinically more accurate than the Holladay and SRK/T formulas in eyes shorter than 22.0 mm. Even the original nonpersonalized constant ACD Hoffer formula compared with SRK I (using the most valid possible optimized personal A-constant) has a better mean absolute error (0.56 versus 0.59) and a significantly better range of IOL prediction error (3.44 diopters [D] versus 7.31 D). The range of error of the Hoffer Q formula (3.59 D) was half that of SRK I (7.31 D). The highest IOL power errors in the 450 eyes were in the SRK II (3.14 D) and SRK I (6.14 D); the power error was 2.08 D using the Hoffer Q formula. The series using overall personalized ACD was more accurate than using an axial length subgroup personalized ACD in each axial length subgroup. The results strongly support replacing regression formulas with third-generation personalized theoretic formulas and carefully evaluating the Holladay, SRK/T, and Hoffer Q formulas.

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Development of the SRK/T intraocular lens implant power calculation formula

John A. Retzlaff, Donald R Sanders, Manus C. Kraff (1990)

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Author and article information

Contributors

Ke Yao:

ORCID: http://orcid.org/0000-0002-6764-7365

xlren@zju.edu.cn

Journal

Journal ID (nlm-ta): Sci Rep

Journal ID (iso-abbrev): Sci Rep

Title: Scientific Reports

Publisher: Nature Publishing Group UK (London )

ISSN (Electronic): 2045-2322

Publication date (Electronic): 14 February 2020

Publication date PMC-release: 14 February 2020

Publication date Collection: 2020

Volume: 10

Electronic Location Identifier: 2645

Affiliations

[1 ]ISNI 0000 0004 1759 700X, GRID grid.13402.34, Eye Center, Second Affiliated Hospital, School of Medicine, , Zhejiang University, ; Hangzhou Zhejiang, P.R. China

[2 ]Key Laboratory of Ophthalmology of Zhejiang Province, Hangzhou Zhejiang, P.R. China

[3 ]ISNI 0000 0001 0348 3990, GRID grid.268099.c, The Eye Hospital, , Wenzhou Medical University, ; Wenzhou Zhejiang, P.R. China

Author information

Ke Yao http://orcid.org/0000-0002-6764-7365

Article

Publisher ID: 59487

DOI: 10.1038/s41598-020-59487-1

PMC ID: 7021678

PubMed ID: 32060303

SO-VID: 96cebce3-4c9f-4d40-855e-e06dc6ed12e8

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Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

History

Date received : 22 July 2019

Date accepted : 23 January 2020

Funding

Funded by: FundRef https://doi.org/10.13039/501100001809, National Natural Science Foundation of China (National Science Foundation of China);

Award ID: 81570822

Award ID: 81870641

Award ID: 81570822

Award ID: 81870641

Award ID: 81570822

Award ID: 81870641

Award Recipient : Hui Chen Xinyi Chen Hanle Wang Zhi Fang Ke Yao

Funded by: Zhejiang Key Laboratory Fund of China (No. 2011E10006).

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ScienceOpen disciplines: Uncategorized

Keywords: corneal diseases,lens diseases

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ScienceOpen disciplines: Uncategorized

Keywords: corneal diseases, lens diseases

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Intraocular Lens power calculation after laser refractive surgery: A Meta-Analysis

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Most cited references 30

Comparison of immersion ultrasound biometry and partial coherence interferometry for intraocular lens calculation according to Haigis.

The Hoffer Q formula: a comparison of theoretic and regression formulas.

Development of the SRK/T intraocular lens implant power calculation formula

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