Clinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not

Elizabeth Yeu,1 Albert Y Cheung,1 Richard Potvin2 1Virginia Eye Consultants, Norfolk, VA, USA; 2Science in Vision, Akron, NY, USACorrespondence: Elizabeth YeuVirginia Eye Consultants, 241 Corporate Blvd., Norfolk, VA 23502, USATel +1 757-742-3902Email eyeulin@gmail.comPurpose: To compare toric intra...

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Autores principales:	Yeu E, Cheung AY, Potvin R
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2020
Materias:	posterior corneal astigmatism cylinder residual refraction toric calculator Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/5a2ee5fdf59744148d61d0afe8f1e62d
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spelling	oai:doaj.org-article:5a2ee5fdf59744148d61d0afe8f1e62d2021-12-02T08:31:21ZClinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not1177-5483https://doaj.org/article/5a2ee5fdf59744148d61d0afe8f1e62d2020-03-01T00:00:00Zhttps://www.dovepress.com/clinical-outcomes-of-toric-intraocular-lenses-differences-in-expected--peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Elizabeth Yeu,1 Albert Y Cheung,1 Richard Potvin2 1Virginia Eye Consultants, Norfolk, VA, USA; 2Science in Vision, Akron, NY, USACorrespondence: Elizabeth YeuVirginia Eye Consultants, 241 Corporate Blvd., Norfolk, VA 23502, USATel +1 757-742-3902Email eyeulin@gmail.comPurpose: To compare toric intraocular lens (IOL) outcome accuracy after using an online toric calculator that accounted for posterior corneal astigmatism versus a traditional calculator that only accounted for anterior corneal astigmatism.Patients and Methods: This was a single-arm, non-masked, non-randomized prospective study in a single private practice in Norfolk, Virginia, USA, evaluating clinical outcomes of toric IOL implantation based on a calculator that considered posterior corneal astigmatism (PCA) and effective lens position (ELP). Of interest was the distribution of the residual refraction (sphere and cylinder) at 40– 70 days postoperative. Residual refractive cylinder (RRC) was compared to the back-calculated theoretical results using a legacy calculator that did not consider PCA. Distance visual acuity (best-corrected and uncorrected) and the manifest refraction were also measured, along with preoperative and postoperative keratometry.Results: Forty-six eyes of 34 subjects were available for analysis. All eyes had a spherical equivalent refraction within 0.5D of intended. Uncorrected visual acuity was 20/25 or better in 86% of eyes targeted for emmetropia. Residual cylinder was 0.50D or less in 96% of eyes, with a maximum of 0.75D measured. The difference between residual cylinder and the expected cylinder from calculations was significantly lower for the calculator that included consideration of PCA and ELP relative to the one that did not.Conclusion: Use of a toric IOL calculator that includes consideration of posterior corneal astigmatism is recommended to optimize clinical outcomes.Keywords: posterior corneal astigmatism, cylinder, residual refraction, toric calculatorYeu ECheung AYPotvin RDove Medical Pressarticleposterior corneal astigmatismcylinderresidual refractiontoric calculatorOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 14, Pp 815-822 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	posterior corneal astigmatism cylinder residual refraction toric calculator Ophthalmology RE1-994
spellingShingle	posterior corneal astigmatism cylinder residual refraction toric calculator Ophthalmology RE1-994 Yeu E Cheung AY Potvin R Clinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not
description	Elizabeth Yeu,1 Albert Y Cheung,1 Richard Potvin2 1Virginia Eye Consultants, Norfolk, VA, USA; 2Science in Vision, Akron, NY, USACorrespondence: Elizabeth YeuVirginia Eye Consultants, 241 Corporate Blvd., Norfolk, VA 23502, USATel +1 757-742-3902Email eyeulin@gmail.comPurpose: To compare toric intraocular lens (IOL) outcome accuracy after using an online toric calculator that accounted for posterior corneal astigmatism versus a traditional calculator that only accounted for anterior corneal astigmatism.Patients and Methods: This was a single-arm, non-masked, non-randomized prospective study in a single private practice in Norfolk, Virginia, USA, evaluating clinical outcomes of toric IOL implantation based on a calculator that considered posterior corneal astigmatism (PCA) and effective lens position (ELP). Of interest was the distribution of the residual refraction (sphere and cylinder) at 40– 70 days postoperative. Residual refractive cylinder (RRC) was compared to the back-calculated theoretical results using a legacy calculator that did not consider PCA. Distance visual acuity (best-corrected and uncorrected) and the manifest refraction were also measured, along with preoperative and postoperative keratometry.Results: Forty-six eyes of 34 subjects were available for analysis. All eyes had a spherical equivalent refraction within 0.5D of intended. Uncorrected visual acuity was 20/25 or better in 86% of eyes targeted for emmetropia. Residual cylinder was 0.50D or less in 96% of eyes, with a maximum of 0.75D measured. The difference between residual cylinder and the expected cylinder from calculations was significantly lower for the calculator that included consideration of PCA and ELP relative to the one that did not.Conclusion: Use of a toric IOL calculator that includes consideration of posterior corneal astigmatism is recommended to optimize clinical outcomes.Keywords: posterior corneal astigmatism, cylinder, residual refraction, toric calculator
format	article
author	Yeu E Cheung AY Potvin R
author_facet	Yeu E Cheung AY Potvin R
author_sort	Yeu E
title	Clinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not
title_short	Clinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not
title_full	Clinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not
title_fullStr	Clinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not
title_full_unstemmed	Clinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not
title_sort	clinical outcomes of toric intraocular lenses: differences in expected outcomes when using a calculator that considers effective lens position and the posterior cornea vs one that does not
publisher	Dove Medical Press
publishDate	2020
url	https://doaj.org/article/5a2ee5fdf59744148d61d0afe8f1e62d
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Clinical Outcomes of Toric Intraocular Lenses: Differences in Expected Outcomes When Using a Calculator That Considers Effective Lens Position and the Posterior Cornea vs One That Does Not

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