Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens

Filomena J Ribeiro,1,2 Tiago B Ferreira,1,3 Catarina Relha,1 Carina Esteves,1 Sylvia Gaspar11Ophthalmology Department, Luz Hospital, Lisbon, Portugal; 2Faculdade De Medicina Da Universidade De Lisboa, Lisbon, Portugal; 3NOVA Medical School, Lisbon, PortugalCorrespondence: Filomena J RibeiroLuz Hospi...

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Autores principales:	Ribeiro FJ, Ferreira TB, Relha C, Esteves C, Gaspar S
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2019
Materias:	Astigmatism toric IOL toric IOL calculation Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/df3487ee526c4fa5b535343dc1dce358
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spelling	oai:doaj.org-article:df3487ee526c4fa5b535343dc1dce3582021-12-02T07:14:53ZPredictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens1177-5483https://doaj.org/article/df3487ee526c4fa5b535343dc1dce3582019-08-01T00:00:00Zhttps://www.dovepress.com/predictability-of-different-calculators-in-the-minimization-of-postope-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Filomena J Ribeiro,1,2 Tiago B Ferreira,1,3 Catarina Relha,1 Carina Esteves,1 Sylvia Gaspar11Ophthalmology Department, Luz Hospital, Lisbon, Portugal; 2Faculdade De Medicina Da Universidade De Lisboa, Lisbon, Portugal; 3NOVA Medical School, Lisbon, PortugalCorrespondence: Filomena J RibeiroLuz Hospital, Avenida Lusíada 100, Lisbon 1500-650, PortugalTel +351 21 710 4400Email tiagoferreira@netcabo.ptPurpose: To assess the efficacy of five calculators for toric intraocular lenses (IOL).Methods: Retrospective comparative case series in cataract patients undergoing implantation of trifocal toric IOLs (PhysIOL FineVision POD FT). Inclusion criteria were age-related cataract and a corneal astigmatism between 0.90D and 4.50D. Refractive astigmatism predictability of five different toric calculators or calculation methods were compared. Furthermore, two groups were differentiated according to the type of astigmatism. The mean absolute error and the centroid errors in the predicted residual astigmatism from each calculator were evaluated.Results: Fifty-one eyes of 43 patients were included in the study. For the standard toric calculator using anterior keratometry values only, the centroid prediction error was 0.39D±0.41@166º, which was reduced by the application of the PhysIOL toric calculator that includes the Abulafia-Koch regression formula and adjustment for the effective lens position (0.05D±0.34@167º), and also by the application of the Barrett toric calculator (0.07D±0.28@160º). Regarding the techniques that directly evaluate posterior corneal surface, the Holladay toric calculator, using total corneal power provided by a color-LED topographer, generated better results (0.10D±0.44@156º) than those using Scheimpflug camera data (0.23D±0.56@158º). Similar results were found for both types of astigmatism.Conclusion: The PhysIOL and the Barrett toric calculators taking into account the posterior corneal astigmatism by mathematical models, yielded lower astigmatic prediction errors compared to a standard toric calculator based on anterior keratometry data only. When total corneal power measurements were used, prediction errors were lower with color-LED than with Scheimpflug based topography.Keywords: astigmatism, toric IOL, toric IOL calculationRibeiro FJFerreira TBRelha CEsteves CGaspar SDove Medical PressarticleAstigmatismtoric IOLtoric IOL calculationOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 13, Pp 1649-1656 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Astigmatism toric IOL toric IOL calculation Ophthalmology RE1-994
spellingShingle	Astigmatism toric IOL toric IOL calculation Ophthalmology RE1-994 Ribeiro FJ Ferreira TB Relha C Esteves C Gaspar S Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens
description	Filomena J Ribeiro,1,2 Tiago B Ferreira,1,3 Catarina Relha,1 Carina Esteves,1 Sylvia Gaspar11Ophthalmology Department, Luz Hospital, Lisbon, Portugal; 2Faculdade De Medicina Da Universidade De Lisboa, Lisbon, Portugal; 3NOVA Medical School, Lisbon, PortugalCorrespondence: Filomena J RibeiroLuz Hospital, Avenida Lusíada 100, Lisbon 1500-650, PortugalTel +351 21 710 4400Email tiagoferreira@netcabo.ptPurpose: To assess the efficacy of five calculators for toric intraocular lenses (IOL).Methods: Retrospective comparative case series in cataract patients undergoing implantation of trifocal toric IOLs (PhysIOL FineVision POD FT). Inclusion criteria were age-related cataract and a corneal astigmatism between 0.90D and 4.50D. Refractive astigmatism predictability of five different toric calculators or calculation methods were compared. Furthermore, two groups were differentiated according to the type of astigmatism. The mean absolute error and the centroid errors in the predicted residual astigmatism from each calculator were evaluated.Results: Fifty-one eyes of 43 patients were included in the study. For the standard toric calculator using anterior keratometry values only, the centroid prediction error was 0.39D±0.41@166º, which was reduced by the application of the PhysIOL toric calculator that includes the Abulafia-Koch regression formula and adjustment for the effective lens position (0.05D±0.34@167º), and also by the application of the Barrett toric calculator (0.07D±0.28@160º). Regarding the techniques that directly evaluate posterior corneal surface, the Holladay toric calculator, using total corneal power provided by a color-LED topographer, generated better results (0.10D±0.44@156º) than those using Scheimpflug camera data (0.23D±0.56@158º). Similar results were found for both types of astigmatism.Conclusion: The PhysIOL and the Barrett toric calculators taking into account the posterior corneal astigmatism by mathematical models, yielded lower astigmatic prediction errors compared to a standard toric calculator based on anterior keratometry data only. When total corneal power measurements were used, prediction errors were lower with color-LED than with Scheimpflug based topography.Keywords: astigmatism, toric IOL, toric IOL calculation
format	article
author	Ribeiro FJ Ferreira TB Relha C Esteves C Gaspar S
author_facet	Ribeiro FJ Ferreira TB Relha C Esteves C Gaspar S
author_sort	Ribeiro FJ
title	Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens
title_short	Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens
title_full	Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens
title_fullStr	Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens
title_full_unstemmed	Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens
title_sort	predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens
publisher	Dove Medical Press
publishDate	2019
url	https://doaj.org/article/df3487ee526c4fa5b535343dc1dce358
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Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens

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