Predictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators

Seth M Pantanelli,1 Neal Kansara,1 Gerard Smits2 1Department of Ophthalmology, Penn State College of Medicine, Hershey, PA, USA; 2Computer and Statistical Consultants Incorporated, Santa Barbara, CA, USACorrespondence: Seth M PantanelliDepartment of Ophthalmology, Penn State College of Medicine, 500...

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Autores principales:	Pantanelli SM, Kansara N, Smits G
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2020
Materias:	cataract toric intraocular lens power astigmatism calculators evo Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/eef10c681afd4015991ddcd43a4c0ff7
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spelling	oai:doaj.org-article:eef10c681afd4015991ddcd43a4c0ff72021-12-02T10:22:49ZPredictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators1177-5483https://doaj.org/article/eef10c681afd4015991ddcd43a4c0ff72020-10-01T00:00:00Zhttps://www.dovepress.com/predictability-of-residual-postoperative-astigmatism-after-implantatio-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Seth M Pantanelli,1 Neal Kansara,1 Gerard Smits2 1Department of Ophthalmology, Penn State College of Medicine, Hershey, PA, USA; 2Computer and Statistical Consultants Incorporated, Santa Barbara, CA, USACorrespondence: Seth M PantanelliDepartment of Ophthalmology, Penn State College of Medicine, 500 University Drive; HU19, Hershey, PA 17033-0850, USATel +1 717-531-5690Fax +1 717-531-5009Email spantanelli@pennstatehealth.psu.eduPurpose: To compare predictability of postoperative refractive astigmatism (RA) using the Emmetropic Verifying Optical (EVO) Toric Formula v2.0 to one that accounts only for anterior corneal astigmatism.Methods: This is a secondary analysis of de-identified data from a clinical trial including 9 sites across the United States. Preoperative biometry was used to predict postoperative RA with the implanted toric IOL using legacy enVista and EVO online calculators. The RA prediction error was computed between back-calculated postoperative RA and predicted residual RA. Outcome measures included vector (centroid) and arithmetic mean RA prediction error.Results: Comparison of calculators was based on 109 eyes, 97 (89%) of which were implanted with a toric IOL with an effective astigmatism power of 1.4 D or less. Centroid of the RA prediction errors was 0.37 D @ 178 and 0.17 D @ 090 for the legacy and EVO calculators, respectively (p < 0.0001). The proportion of eyes with an absolute RA prediction error ≤ 0.5 was 47.3% and 49.1% (p = 0.78), while the proportion of eyes ≤ 1.0 D was 82.7% and 89.1% (p = 0.03). Differences in the proportions ≤ 0.5 D existed for WTR (p = 0.015) but not ATR (p = 0.75) eyes. The proportion in which orientation of the predicted RA (ATR, WTR, or oblique) matched the actual RA was 62% and 78% for legacy and EVO calculators, respectively (p = 0.0029).Conclusion: The EVO Toric Formula v2.0 out-performed the legacy calculator with regards to predictions in eyes with low astigmatism.Keywords: cataract, toric, intraocular lens power, astigmatism, calculators, EVOPantanelli SMKansara NSmits GDove Medical Pressarticlecataracttoricintraocular lens powerastigmatismcalculatorsevo OphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 14, Pp 3627-3634 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	cataract toric intraocular lens power astigmatism calculators evo Ophthalmology RE1-994
spellingShingle	cataract toric intraocular lens power astigmatism calculators evo Ophthalmology RE1-994 Pantanelli SM Kansara N Smits G Predictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators
description	Seth M Pantanelli,1 Neal Kansara,1 Gerard Smits2 1Department of Ophthalmology, Penn State College of Medicine, Hershey, PA, USA; 2Computer and Statistical Consultants Incorporated, Santa Barbara, CA, USACorrespondence: Seth M PantanelliDepartment of Ophthalmology, Penn State College of Medicine, 500 University Drive; HU19, Hershey, PA 17033-0850, USATel +1 717-531-5690Fax +1 717-531-5009Email spantanelli@pennstatehealth.psu.eduPurpose: To compare predictability of postoperative refractive astigmatism (RA) using the Emmetropic Verifying Optical (EVO) Toric Formula v2.0 to one that accounts only for anterior corneal astigmatism.Methods: This is a secondary analysis of de-identified data from a clinical trial including 9 sites across the United States. Preoperative biometry was used to predict postoperative RA with the implanted toric IOL using legacy enVista and EVO online calculators. The RA prediction error was computed between back-calculated postoperative RA and predicted residual RA. Outcome measures included vector (centroid) and arithmetic mean RA prediction error.Results: Comparison of calculators was based on 109 eyes, 97 (89%) of which were implanted with a toric IOL with an effective astigmatism power of 1.4 D or less. Centroid of the RA prediction errors was 0.37 D @ 178 and 0.17 D @ 090 for the legacy and EVO calculators, respectively (p < 0.0001). The proportion of eyes with an absolute RA prediction error ≤ 0.5 was 47.3% and 49.1% (p = 0.78), while the proportion of eyes ≤ 1.0 D was 82.7% and 89.1% (p = 0.03). Differences in the proportions ≤ 0.5 D existed for WTR (p = 0.015) but not ATR (p = 0.75) eyes. The proportion in which orientation of the predicted RA (ATR, WTR, or oblique) matched the actual RA was 62% and 78% for legacy and EVO calculators, respectively (p = 0.0029).Conclusion: The EVO Toric Formula v2.0 out-performed the legacy calculator with regards to predictions in eyes with low astigmatism.Keywords: cataract, toric, intraocular lens power, astigmatism, calculators, EVO
format	article
author	Pantanelli SM Kansara N Smits G
author_facet	Pantanelli SM Kansara N Smits G
author_sort	Pantanelli SM
title	Predictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators
title_short	Predictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators
title_full	Predictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators
title_fullStr	Predictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators
title_full_unstemmed	Predictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators
title_sort	predictability of residual postoperative astigmatism after implantation of a toric intraocular lens using two different calculators
publisher	Dove Medical Press
publishDate	2020
url	https://doaj.org/article/eef10c681afd4015991ddcd43a4c0ff7
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Predictability of Residual Postoperative Astigmatism After Implantation of a Toric Intraocular Lens Using Two Different Calculators

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