Correlation Between Keratometric and Refractive Astigmatism in Pseudophakes

Correlation Between Keratometric and Refractive Astigmatism in Pseudophakes

Shavini Athukorala,1 Neal Kansara,2 Erik Lehman,3 Seth M Pantanelli1 1Department of Ophthalmology, Penn State College of Medicine, Hershey, PA, USA; 2Department of Ophthalmology, Baylor College of Medicine, Houston, TX, USA; 3Department of Public Health Sciences, Penn State College of Medicine, Hers...

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Autores principales: Athukorala S, Kansara N, Lehman E, Pantanelli SM
Formato: article
Lenguaje:EN
Publicado: Dove Medical Press 2021
Materias:
astigmatism
biometry
keratometry
Ophthalmology
RE1-994
Acceso en línea:https://doaj.org/article/24f5b4d187cd424198e4d79a4a407d42
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spelling oai:doaj.org-article:24f5b4d187cd424198e4d79a4a407d422021-12-02T18:13:47ZCorrelation Between Keratometric and Refractive Astigmatism in Pseudophakes1177-5483https://doaj.org/article/24f5b4d187cd424198e4d79a4a407d422021-09-01T00:00:00Zhttps://www.dovepress.com/correlation-between-keratometric-and-refractive-astigmatism-in-pseudop-peer-reviewed-fulltext-article-OPTHhttps://doaj.org/toc/1177-5483Shavini Athukorala,1 Neal Kansara,2 Erik Lehman,3 Seth M Pantanelli1 1Department of Ophthalmology, Penn State College of Medicine, Hershey, PA, USA; 2Department of Ophthalmology, Baylor College of Medicine, Houston, TX, USA; 3Department of Public Health Sciences, Penn State College of Medicine, Hershey, PA, 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 investigate the relationship between measured anterior, posterior, and total keratometric astigmatism and post-operative refractive astigmatism (RA) after cataract surgery.Patients and Methods: This was a retrospective analysis of eyes that consecutively underwent pre-operative measurements of keratometric astigmatism with a swept-source optical coherence tomography (SS-OCT)-based optical biometer and dual-Scheimpflug/Placido disc corneal topographer, cataract surgery with implantation of a monofocal intraocular lens, and post-operative manifest refraction. The difference between post-operative refractive astigmatism and keratometric astigmatism measured using four different ways [Keratometry (K), Simulated Keratometry (SimK), Total Keratometry (TK), and Total Corneal Power (TCP)] was calculated.Results: For all 118 eyes, a smaller mean vector difference between post-operative refractive astigmatism and measured keratometric astigmatism was realized with TK (0.08 @ 151) vs TCP2 (0.30 @ 174; p < 0.0006), as well as with K (0.26 @ 173) vs SimK (0.52 @ 177; p = 0.036). The mean vector difference between post-operative refractive astigmatism and TK astigmatism was 0.31 @ 097, 0.21 @ 163, and 0.69 @ 179 in eyes with against-the rule (ATR), oblique, and with-the-rule (WTR) anterior corneal astigmatism, respectively (p < 0.0006). On the other hand, posterior corneal astigmatism did not significantly change with the orientation of anterior corneal astigmatism [0.10 @ 180 for ATR, 0.22 @ 180 for oblique, and 0.28 @ 180 for WTR (p = 0.58)].Conclusion: Compared with the other measures of corneal astigmatism, total keratometric astigmatism from the SS-OCT device most closely correlated with post-operative RA. The difference between anterior corneal astigmatism and refractive astigmatism is not completely explained by the contribution from the posterior cornea. Other contributors, such as lens tilt or neuro-adaptation, may be at play.Keywords: astigmatism, biometry, keratometryAthukorala SKansara NLehman EPantanelli SMDove Medical PressarticleastigmatismbiometrykeratometryOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 15, Pp 3909-3913 (2021)
institution DOAJ
collection DOAJ
language EN
topic astigmatism
biometry
keratometry
Ophthalmology
RE1-994
spellingShingle astigmatism
biometry
keratometry
Ophthalmology
RE1-994
Athukorala S
Kansara N
Lehman E
Pantanelli SM
Correlation Between Keratometric and Refractive Astigmatism in Pseudophakes
description Shavini Athukorala,1 Neal Kansara,2 Erik Lehman,3 Seth M Pantanelli1 1Department of Ophthalmology, Penn State College of Medicine, Hershey, PA, USA; 2Department of Ophthalmology, Baylor College of Medicine, Houston, TX, USA; 3Department of Public Health Sciences, Penn State College of Medicine, Hershey, PA, 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 investigate the relationship between measured anterior, posterior, and total keratometric astigmatism and post-operative refractive astigmatism (RA) after cataract surgery.Patients and Methods: This was a retrospective analysis of eyes that consecutively underwent pre-operative measurements of keratometric astigmatism with a swept-source optical coherence tomography (SS-OCT)-based optical biometer and dual-Scheimpflug/Placido disc corneal topographer, cataract surgery with implantation of a monofocal intraocular lens, and post-operative manifest refraction. The difference between post-operative refractive astigmatism and keratometric astigmatism measured using four different ways [Keratometry (K), Simulated Keratometry (SimK), Total Keratometry (TK), and Total Corneal Power (TCP)] was calculated.Results: For all 118 eyes, a smaller mean vector difference between post-operative refractive astigmatism and measured keratometric astigmatism was realized with TK (0.08 @ 151) vs TCP2 (0.30 @ 174; p < 0.0006), as well as with K (0.26 @ 173) vs SimK (0.52 @ 177; p = 0.036). The mean vector difference between post-operative refractive astigmatism and TK astigmatism was 0.31 @ 097, 0.21 @ 163, and 0.69 @ 179 in eyes with against-the rule (ATR), oblique, and with-the-rule (WTR) anterior corneal astigmatism, respectively (p < 0.0006). On the other hand, posterior corneal astigmatism did not significantly change with the orientation of anterior corneal astigmatism [0.10 @ 180 for ATR, 0.22 @ 180 for oblique, and 0.28 @ 180 for WTR (p = 0.58)].Conclusion: Compared with the other measures of corneal astigmatism, total keratometric astigmatism from the SS-OCT device most closely correlated with post-operative RA. The difference between anterior corneal astigmatism and refractive astigmatism is not completely explained by the contribution from the posterior cornea. Other contributors, such as lens tilt or neuro-adaptation, may be at play.Keywords: astigmatism, biometry, keratometry
format article
author Athukorala S
Kansara N
Lehman E
Pantanelli SM
author_facet Athukorala S
Kansara N
Lehman E
Pantanelli SM
author_sort Athukorala S
title Correlation Between Keratometric and Refractive Astigmatism in Pseudophakes
title_short Correlation Between Keratometric and Refractive Astigmatism in Pseudophakes
title_full Correlation Between Keratometric and Refractive Astigmatism in Pseudophakes
title_fullStr Correlation Between Keratometric and Refractive Astigmatism in Pseudophakes
title_full_unstemmed Correlation Between Keratometric and Refractive Astigmatism in Pseudophakes
title_sort correlation between keratometric and refractive astigmatism in pseudophakes
publisher Dove Medical Press
publishDate 2021
url https://doaj.org/article/24f5b4d187cd424198e4d79a4a407d42
work_keys_str_mv AT athukoralas correlationbetweenkeratometricandrefractiveastigmatisminpseudophakes
AT kansaran correlationbetweenkeratometricandrefractiveastigmatisminpseudophakes
AT lehmane correlationbetweenkeratometricandrefractiveastigmatisminpseudophakes
AT pantanellism correlationbetweenkeratometricandrefractiveastigmatisminpseudophakes
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