Evaluation of Wang-Koch optimisation of axial length for intraocular lens power calculation in myopic eyes

African Vision and Eye Health

Field Value
Title Evaluation of Wang-Koch optimisation of axial length for intraocular lens power calculation in myopic eyes
Creator Atalla, Abdel-Rahman El-Agha, Mohamed-Sameh Osman, Amr A. Khaled, Mahmoud O.
Subject ophthalmology; vision science; optometry IOL power calculation; phacoemulsification; optical biometry; myopia; Wang-Koch
Description Background: Refractive outcome has become more relevant in myopic patients. Refractive surprises are mainly caused by errors in axial length (AL) measurement.Aim: This study aimed to evaluate the accuracy of intraocular lens (IOL) power calculation in myopic eyes using the AL measured by optical biometry versus an optimised AL calculated by the Wang-Koch method.Setting: Ophthalmology Department, Cairo University and Ophthalmic Diagnostic and Laser Unit, Cairo University Hospitals, both in Cairo, Egypt.Methods: A prospective study of 30 eyes of 23 patients with ALs greater than 25.0 mm that underwent phacoemulsification with IOL implantation in the capsular bag. The LENSTAR was used for preoperative IOL power calculation using the Holladay 1 formula and the LENSTAR AL (group 1), and for back-calculation of the prediction error (PE) for the same 30 eyes using the Holladay 1 formula and the optimised AL (group 2). Postoperative PEs and mean absolute errors (MAEs) were calculated six weeks after surgery.Results: The postoperative spherical equivalent was within ± 1.00 dioptre (D) of predicted in 86.7% and 90.0% of eyes, respectively, (p = 0.69). However, 66.7% of eyes had a hyperopic outcome in group 1, in comparison to 20.0% that would be left hyperopic using the optimised AL in group 2 (p  0.05).Conclusion: The Wang-Koch method of optimising the AL would have significantly reduced the percentage of eyes rendered hyperopic using the LENSTAR AL from 66.7% to 20.0%. This difference represents a clinically significant improvement in IOL power prediction in these eyes.
Publisher AOSIS
Contributor None
Date 2022-12-08
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — Original research, prospective; observational study
Format text/html application/epub+zip text/xml application/pdf
Identifier 10.4102/aveh.v81i1.702
Source African Vision and Eye Health; Vol 81, No 1 (2022); 6 pages 2410-1516 2413-3183
Language eng
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https://avehjournal.org/index.php/aveh/article/view/702/2038 https://avehjournal.org/index.php/aveh/article/view/702/2039 https://avehjournal.org/index.php/aveh/article/view/702/2040 https://avehjournal.org/index.php/aveh/article/view/702/2041
Coverage Africa; Egypt; Cairo 2019-2020 35 years and older; myopic patients
Rights Copyright (c) 2022 Abdel-Rahman Atalla, Mohamed-Sameh El-Agha, Amr A. Osman, Mahmoud O. Khaled https://creativecommons.org/licenses/by/4.0