Vector analysis investigation of toric intraocular lens with no deviation from the intended axis

Atsushi Kawahara,1,2 Yoshinori Takayanagi1 1Takayanagi Clinic, Kushiro, 2Sapporo Kato Eye Clinic, Sapporo, Hokkaido, Japan Aim: The aim of this research was to evaluate vector analysis after implantation of toric intraocular lenses (IOLs) without deviation from the intended axis. Methods: The stud...

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Autores principales:	Kawahara A, Takayanagi Y
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2016
Materias:	cataract surgery astigmatism toric intraocular lens Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/6ab982f4eef84513a392948b4eaa4e95
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spelling	oai:doaj.org-article:6ab982f4eef84513a392948b4eaa4e952021-12-02T06:23:59ZVector analysis investigation of toric intraocular lens with no deviation from the intended axis1177-5483https://doaj.org/article/6ab982f4eef84513a392948b4eaa4e952016-11-01T00:00:00Zhttps://www.dovepress.com/vector--analysis-investigation-of-toric-intraocular-lens-with-no-devia-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Atsushi Kawahara,1,2 Yoshinori Takayanagi1 1Takayanagi Clinic, Kushiro, 2Sapporo Kato Eye Clinic, Sapporo, Hokkaido, Japan Aim: The aim of this research was to evaluate vector analysis after implantation of toric intraocular lenses (IOLs) without deviation from the intended axis. Methods: The study included 18 eyes of 16 patients who underwent cataract surgery with the insertion of a toric implant (AcrySof IQ Toric). The postoperative IOL meridian placement completely corresponded to that planned. Using vector analysis, surgically induced astigmatism (SIA) was derived from the refractive outcome versus the predicted postoperative keratometric astigmatism and was compared with targeted induced astigmatism (TIA). The difference vector (DV) was derived by calculating the vector expression of the remaining astigmatic change. Results: The mean postoperative remaining refractive astigmatism of 0.73±0.55 diopters (D) was achieved versus the mean target of 0.44±0.28 D. There was a difference of 0.29 D between the target and achieved values. The mean SIA value was 1.90±0.99 D compared with the mean TIA value of 2.00±0.85 D. The mean DV value was 0.87±0.56 D. The astigmatism correction index (SIA/TIA) was 0.95, which was near the ideal value of 1. The index of success (DV/TIA) was 0.44, which was far from the ideal value of 0. Conclusion: The implantation of toric IOLs is an effective, predictable method for astigmatic correction. However, some remaining astigmatism is present even if toric IOLs are placed accurately. Keywords: cataract surgery, astigmatism, toric intraocular lens, alpins method, toric calculator, remaining astigmatismKawahara ATakayanagi YDove Medical Pressarticlecataract surgeryastigmatismtoric intraocular lensOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 10, Pp 2199-2203 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	cataract surgery astigmatism toric intraocular lens Ophthalmology RE1-994
spellingShingle	cataract surgery astigmatism toric intraocular lens Ophthalmology RE1-994 Kawahara A Takayanagi Y Vector analysis investigation of toric intraocular lens with no deviation from the intended axis
description	Atsushi Kawahara,1,2 Yoshinori Takayanagi1 1Takayanagi Clinic, Kushiro, 2Sapporo Kato Eye Clinic, Sapporo, Hokkaido, Japan Aim: The aim of this research was to evaluate vector analysis after implantation of toric intraocular lenses (IOLs) without deviation from the intended axis. Methods: The study included 18 eyes of 16 patients who underwent cataract surgery with the insertion of a toric implant (AcrySof IQ Toric). The postoperative IOL meridian placement completely corresponded to that planned. Using vector analysis, surgically induced astigmatism (SIA) was derived from the refractive outcome versus the predicted postoperative keratometric astigmatism and was compared with targeted induced astigmatism (TIA). The difference vector (DV) was derived by calculating the vector expression of the remaining astigmatic change. Results: The mean postoperative remaining refractive astigmatism of 0.73±0.55 diopters (D) was achieved versus the mean target of 0.44±0.28 D. There was a difference of 0.29 D between the target and achieved values. The mean SIA value was 1.90±0.99 D compared with the mean TIA value of 2.00±0.85 D. The mean DV value was 0.87±0.56 D. The astigmatism correction index (SIA/TIA) was 0.95, which was near the ideal value of 1. The index of success (DV/TIA) was 0.44, which was far from the ideal value of 0. Conclusion: The implantation of toric IOLs is an effective, predictable method for astigmatic correction. However, some remaining astigmatism is present even if toric IOLs are placed accurately. Keywords: cataract surgery, astigmatism, toric intraocular lens, alpins method, toric calculator, remaining astigmatism
format	article
author	Kawahara A Takayanagi Y
author_facet	Kawahara A Takayanagi Y
author_sort	Kawahara A
title	Vector analysis investigation of toric intraocular lens with no deviation from the intended axis
title_short	Vector analysis investigation of toric intraocular lens with no deviation from the intended axis
title_full	Vector analysis investigation of toric intraocular lens with no deviation from the intended axis
title_fullStr	Vector analysis investigation of toric intraocular lens with no deviation from the intended axis
title_full_unstemmed	Vector analysis investigation of toric intraocular lens with no deviation from the intended axis
title_sort	vector analysis investigation of toric intraocular lens with no deviation from the intended axis
publisher	Dove Medical Press
publishDate	2016
url	https://doaj.org/article/6ab982f4eef84513a392948b4eaa4e95
work_keys_str_mv	AT kawaharaa vectoranalysisinvestigationoftoricintraocularlenswithnodeviationfromtheintendedaxis AT takayanagiy vectoranalysisinvestigationoftoricintraocularlenswithnodeviationfromtheintendedaxis
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Vector analysis investigation of toric intraocular lens with no deviation from the intended axis

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