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Intraocular Lens Power Calculation after Refractive Surgery: A Comparative Analysis of Accuracy and Predictability

PURPOSE: To compare the accuracy of intraocular lens (IOL) power calculation using conventional regression formulae or the American Society of Cataract and Refractive Surgery (ASCRS) IOL power calculator for previous corneal refractive surgery. METHODS: We retrospectively reviewed 96 eyes from 68 pa...

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Detalles Bibliográficos
Autores principales: Kang, Byeong Soo, Han, Jeong Mo, Oh, Joo Youn, Kim, Mee Kum, Wee, Won Ryang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Korean Ophthalmological Society 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5726982/
https://www.ncbi.nlm.nih.gov/pubmed/28913996
http://dx.doi.org/10.3341/kjo.2016.0078
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author Kang, Byeong Soo
Han, Jeong Mo
Oh, Joo Youn
Kim, Mee Kum
Wee, Won Ryang
author_facet Kang, Byeong Soo
Han, Jeong Mo
Oh, Joo Youn
Kim, Mee Kum
Wee, Won Ryang
author_sort Kang, Byeong Soo
collection PubMed
description PURPOSE: To compare the accuracy of intraocular lens (IOL) power calculation using conventional regression formulae or the American Society of Cataract and Refractive Surgery (ASCRS) IOL power calculator for previous corneal refractive surgery. METHODS: We retrospectively reviewed 96 eyes from 68 patients that had undergone cataract surgery after keratorefractive surgeries. We calculated the formula with two approaches: IOL powers using the ASCRS IOL power calculator and IOL powers using conventional formulae with previous refractive data (Camellin, Jarade, Savini, and clinical history method) or without prior data (0, 2 and, 4 mm total mean power in topography, Wang-Koch-Maloney, Shammas, Seitz, and Maloney). Two conventional IOL formulae (the SRK/T and the Hoffer Q) were calculated with the single K and double K methods. Mean arithmetic refractive error and mean absolute error were calculated at the first postoperative month. RESULTS: In conventional formulae, the Jarade method or the Seitz method, applied in the Hoffer Q formula with the single K or double K method, have the lowest prediction errors. The least prediction error was found in the Shammas-PL method in the ASCRS group. There was no statistically significant difference between the 10 lowest mean absolute error conventional methods, the Shammas-PL method and the Barrett True-K method calculated with using the ASCRS calculator, without using preoperative data. CONCLUSIONS: The Shammas-PL formula and the Barrett True-K formula, calculated with the ASCRS calculator, without using history, were methods comparable to the 10 most accurate conventional formulae. Other methods using the ASCRS calculator show a myopic tendency.
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spelling pubmed-57269822017-12-13 Intraocular Lens Power Calculation after Refractive Surgery: A Comparative Analysis of Accuracy and Predictability Kang, Byeong Soo Han, Jeong Mo Oh, Joo Youn Kim, Mee Kum Wee, Won Ryang Korean J Ophthalmol Original Article PURPOSE: To compare the accuracy of intraocular lens (IOL) power calculation using conventional regression formulae or the American Society of Cataract and Refractive Surgery (ASCRS) IOL power calculator for previous corneal refractive surgery. METHODS: We retrospectively reviewed 96 eyes from 68 patients that had undergone cataract surgery after keratorefractive surgeries. We calculated the formula with two approaches: IOL powers using the ASCRS IOL power calculator and IOL powers using conventional formulae with previous refractive data (Camellin, Jarade, Savini, and clinical history method) or without prior data (0, 2 and, 4 mm total mean power in topography, Wang-Koch-Maloney, Shammas, Seitz, and Maloney). Two conventional IOL formulae (the SRK/T and the Hoffer Q) were calculated with the single K and double K methods. Mean arithmetic refractive error and mean absolute error were calculated at the first postoperative month. RESULTS: In conventional formulae, the Jarade method or the Seitz method, applied in the Hoffer Q formula with the single K or double K method, have the lowest prediction errors. The least prediction error was found in the Shammas-PL method in the ASCRS group. There was no statistically significant difference between the 10 lowest mean absolute error conventional methods, the Shammas-PL method and the Barrett True-K method calculated with using the ASCRS calculator, without using preoperative data. CONCLUSIONS: The Shammas-PL formula and the Barrett True-K formula, calculated with the ASCRS calculator, without using history, were methods comparable to the 10 most accurate conventional formulae. Other methods using the ASCRS calculator show a myopic tendency. The Korean Ophthalmological Society 2017-12 2017-06-29 /pmc/articles/PMC5726982/ /pubmed/28913996 http://dx.doi.org/10.3341/kjo.2016.0078 Text en © 2017 The Korean Ophthalmological Society http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Kang, Byeong Soo
Han, Jeong Mo
Oh, Joo Youn
Kim, Mee Kum
Wee, Won Ryang
Intraocular Lens Power Calculation after Refractive Surgery: A Comparative Analysis of Accuracy and Predictability
title Intraocular Lens Power Calculation after Refractive Surgery: A Comparative Analysis of Accuracy and Predictability
title_full Intraocular Lens Power Calculation after Refractive Surgery: A Comparative Analysis of Accuracy and Predictability
title_fullStr Intraocular Lens Power Calculation after Refractive Surgery: A Comparative Analysis of Accuracy and Predictability
title_full_unstemmed Intraocular Lens Power Calculation after Refractive Surgery: A Comparative Analysis of Accuracy and Predictability
title_short Intraocular Lens Power Calculation after Refractive Surgery: A Comparative Analysis of Accuracy and Predictability
title_sort intraocular lens power calculation after refractive surgery: a comparative analysis of accuracy and predictability
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5726982/
https://www.ncbi.nlm.nih.gov/pubmed/28913996
http://dx.doi.org/10.3341/kjo.2016.0078
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