Clinical Evaluation of a New Approach for IOL Power Calculation in Keratoconus
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Título: | Clinical Evaluation of a New Approach for IOL Power Calculation in Keratoconus |
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Autor/es: | Camps, Vicente J. | Fikry, Ramy R. | Mateo Pérez, Verónica | Labib, Fady E. | Caravaca Arens, Esteban | Caballero, María T. | Piñero, David P. |
Grupo/s de investigación o GITE: | Grupo de Óptica y Percepción Visual (GOPV) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Óptica, Farmacología y Anatomía |
Palabras clave: | Cataract | Intraocular lens calculation | Keratoconus |
Área/s de conocimiento: | Óptica |
Fecha de publicación: | 2019 |
Editor: | Jaypee Brothers Medical Publishers |
Cita bibliográfica: | Camps VJ, Fikry RR, Mateo VJ, et al. Clinical Evaluation of a New Approach for IOL Power Calculation in Keratoconus. Int J Kerat Ect Cor Dis 2019;8(1):1–6. doi:10.5005/jp-journals-10025-1177 |
Resumen: | Purpose: To obtain an expression of the adjusted IOL power (PIOLadj) in keratoconus eyes associated with minimal errors in IOL power calculation. Materials and methods: This retrospective study included a total of 25 eyes of 25 patients with ages ranging from 20 years to 76 years. The following IOLs were implanted: Acrysof IQ Toric, Acrysof SA60AT in 9 eyes, Sensar in 3 eyes, Tecnis 1 in 4 eyes, and Tecnis Toric in 2 eyes. The PIOLadj is based on Gauss equations, using adjusted keratometric index (nkadj) specific to keratoconus eyes. From this nkadj, an adjusted keratometric corneal power is calculated (Pkadj). The PIOLadj calculation was performed after estimating the effective lens position (ELP) using a mathematical expression obtained by multiple regression analysis (named ELPadj). Comparison between the PIOLadj and the real intraocular power implanted in each patient (PIOLreal) was carried out. Results: No significant differences between PIOLreal and PIOLadj were found. However, differences could be clinically relevant up to of 2.54 D as PIOLreal increases. But, in the range of PIOLreal between 0 and 20 D, differences were lower than 1.5 D, being most of them below 1 D. Conclusion: A new formula of IOL power calculation (PIOLadj) based on the use of an adjusted keratometric power (Pkadj) that considers a variable keratometric index due to the influence of the posterior corneal surface (nkadj) and adjusted effective lens position (ELPadj) is useful for estimating IOL power in low-to-moderate keratoconus, with more limitation in the most advanced keratoconus. |
Patrocinador/es: | David P Piñero is supported by the Spanish Ministry of Economy, Industry, and Competitiveness within the program Ramón y Cajal, RYC-2016-20471. |
URI: | http://hdl.handle.net/10045/105867 |
ISSN: | 2277-3800 (Print) | 2277-4203 (Online) |
DOI: | 10.5005/jp-journals-10025-1177 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and non-commercial reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.5005/jp-journals-10025-1177 |
Aparece en las colecciones: | INV - GOPV - Artículos de Revistas |
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