A New Approach for the Calculation of Total Corneal Astigmatism Considering the Magnitude and Orientation of Posterior Corneal Astigmatism and Thickness
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Título: | A New Approach for the Calculation of Total Corneal Astigmatism Considering the Magnitude and Orientation of Posterior Corneal Astigmatism and Thickness |
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Autor/es: | Piñero, David P. | Caballero, María T. | Nicolás Albujer, Juan Miguel | Fez Saiz, Dolores de | Camps, Vicente J. |
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: | Total corneal astigmatism | Gaussian optics | Keratometry | Power vectors | Keratometric astigmatism |
Área/s de conocimiento: | Óptica |
Fecha de publicación: | jun-2018 |
Editor: | Wolters Kluwer Health |
Cita bibliográfica: | Cornea. 2018, 37(6): 720-726. doi:10.1097/ICO.0000000000001577 |
Resumen: | Purpose: To evaluate a new method of calculation of total corneal astigmatism based on Gaussian optics and the power design of a spherocylindrical lens (C) in the healthy eye and to compare it with keratometric (K) and power vector (PV) methods. Methods: A total of 92 healthy eyes of 92 patients (age, 17–65 years) were enrolled. Corneal astigmatism was calculated in all cases using K, PV, and our new approach C that considers the contribution of corneal thickness. An evaluation of the interchangeability of our new approach with the other 2 methods was performed using Bland–Altman analysis. Results: Statistically significant differences between methods were found in the magnitude of astigmatism (P < 0.001), with the highest values provided by K. These differences in the magnitude of astigmatism were clinically relevant when K and C were compared [limits of agreement (LoA), −0.40 to 0.62 D), but not for the comparison between PV and C (LoA, −0.03 to 0.01 D). Differences in the axis of astigmatism between methods did not reach statistical significance (P = 0.408). However, they were clinically relevant when comparing K and C (LoA, −5.48 to 15.68 degrees) but not for the comparison between PV and C (LoA, −1.68 to 1.42 degrees). Conclusions: The use of our new approach for the calculation of total corneal astigmatism provides astigmatic results comparable to the PV method, which suggests that the effect of pachymetry on total corneal astigmatism is minimal in healthy eyes. |
URI: | http://hdl.handle.net/10045/84034 |
ISSN: | 0277-3740 (Print) | 1536-4798 (Online) |
DOI: | 10.1097/ICO.0000000000001577 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2018 Wolters Kluwer Health, Inc. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1097/ICO.0000000000001577 |
Aparece en las colecciones: | INV - GOPV - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2018_Pinero_etal_Cornea_final.pdf | Versión final (acceso restringido) | 332,14 kB | Adobe PDF | Abrir Solicitar una copia |
2018_Pinero_etal_Cornea_preprint.pdf | Preprint (acceso abierto) | 2,1 MB | Adobe PDF | Abrir Vista previa |
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