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Comparison of Two Toric IOL Calculation Methods
PURPOSE: To compare two calculators for toric intraocular lens (IOL) calculation and to evaluate the prediction of refractive outcome. METHODS: Sixty-four eyes of forty-five patients underwent cataract surgery followed by implantation of a toric intraocular lens (Zeiss Torbi 709 M) calculated by a s...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Hindawi
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5818930/ https://www.ncbi.nlm.nih.gov/pubmed/29545950 http://dx.doi.org/10.1155/2018/2840246 |
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author | Kern, C. Kortüm, K. Müller, M. Kampik, A. Priglinger, S. Mayer, W. J. |
author_facet | Kern, C. Kortüm, K. Müller, M. Kampik, A. Priglinger, S. Mayer, W. J. |
author_sort | Kern, C. |
collection | PubMed |
description | PURPOSE: To compare two calculators for toric intraocular lens (IOL) calculation and to evaluate the prediction of refractive outcome. METHODS: Sixty-four eyes of forty-five patients underwent cataract surgery followed by implantation of a toric intraocular lens (Zeiss Torbi 709 M) calculated by a standard industry calculator using front keratometry values. Prediction error, median absolute error, and refractive astigmatism error were evaluated for the standard calculator. The predicted postoperative refraction and toric lens power values were evaluated and compared after postoperative recalculation using the Barrett calculator. RESULTS: We observed a significant undercorrection in the spherical equivalent (0.19 D) by using a standard calculator (p ≤ 0.05). According to the Baylor nomogram and the refractive influence of posterior corneal astigmatism (PCA), undercorrection of the cylinder was lower for patients with WTR astigmatism, because of the tendency of overcorrection. An advantage of less residual postoperative SE, sphere, and cylinder for the Barrett calculator was observed when retrospectively comparing the calculated predicted postoperative refraction between calculators (p ≤ 0.01). CONCLUSION: Consideration of only corneal front keratometric values for toric lens calculation may lead to postoperative undercorrection of astigmatism. The prediction of postoperative refractive outcome can be improved by using appropriate methods of adjustment in order to take PCA into account. |
format | Online Article Text |
id | pubmed-5818930 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Hindawi |
record_format | MEDLINE/PubMed |
spelling | pubmed-58189302018-03-15 Comparison of Two Toric IOL Calculation Methods Kern, C. Kortüm, K. Müller, M. Kampik, A. Priglinger, S. Mayer, W. J. J Ophthalmol Research Article PURPOSE: To compare two calculators for toric intraocular lens (IOL) calculation and to evaluate the prediction of refractive outcome. METHODS: Sixty-four eyes of forty-five patients underwent cataract surgery followed by implantation of a toric intraocular lens (Zeiss Torbi 709 M) calculated by a standard industry calculator using front keratometry values. Prediction error, median absolute error, and refractive astigmatism error were evaluated for the standard calculator. The predicted postoperative refraction and toric lens power values were evaluated and compared after postoperative recalculation using the Barrett calculator. RESULTS: We observed a significant undercorrection in the spherical equivalent (0.19 D) by using a standard calculator (p ≤ 0.05). According to the Baylor nomogram and the refractive influence of posterior corneal astigmatism (PCA), undercorrection of the cylinder was lower for patients with WTR astigmatism, because of the tendency of overcorrection. An advantage of less residual postoperative SE, sphere, and cylinder for the Barrett calculator was observed when retrospectively comparing the calculated predicted postoperative refraction between calculators (p ≤ 0.01). CONCLUSION: Consideration of only corneal front keratometric values for toric lens calculation may lead to postoperative undercorrection of astigmatism. The prediction of postoperative refractive outcome can be improved by using appropriate methods of adjustment in order to take PCA into account. Hindawi 2018-01-10 /pmc/articles/PMC5818930/ /pubmed/29545950 http://dx.doi.org/10.1155/2018/2840246 Text en Copyright © 2018 C. Kern et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Kern, C. Kortüm, K. Müller, M. Kampik, A. Priglinger, S. Mayer, W. J. Comparison of Two Toric IOL Calculation Methods |
title | Comparison of Two Toric IOL Calculation Methods |
title_full | Comparison of Two Toric IOL Calculation Methods |
title_fullStr | Comparison of Two Toric IOL Calculation Methods |
title_full_unstemmed | Comparison of Two Toric IOL Calculation Methods |
title_short | Comparison of Two Toric IOL Calculation Methods |
title_sort | comparison of two toric iol calculation methods |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5818930/ https://www.ncbi.nlm.nih.gov/pubmed/29545950 http://dx.doi.org/10.1155/2018/2840246 |
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