Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction

Robert P Lehmann1, Diane M Houtman21Lehmann Eye Center, Nacogdoches, TX, 2Alcon Research Ltd, Fort Worth, TX, USAPurpose: To evaluate whether visual performance could be improved in pseudophakic subjects by correcting low levels of postoperative astigmatism.Methods: An exploratory, noninterventional...

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Autores principales:	Lehmann RP, Houtman DM
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2012
Materias:	Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/0fd19960a0af4321b70b921dfe04c020
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spelling	oai:doaj.org-article:0fd19960a0af4321b70b921dfe04c0202021-12-02T11:15:26ZVisual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction1177-54671177-5483https://doaj.org/article/0fd19960a0af4321b70b921dfe04c0202012-03-01T00:00:00Zhttp://www.dovepress.com/visual-performance-in-cataract-patients-with-low-levels-of-postoperati-a9393https://doaj.org/toc/1177-5467https://doaj.org/toc/1177-5483Robert P Lehmann1, Diane M Houtman21Lehmann Eye Center, Nacogdoches, TX, 2Alcon Research Ltd, Fort Worth, TX, USAPurpose: To evaluate whether visual performance could be improved in pseudophakic subjects by correcting low levels of postoperative astigmatism.Methods: An exploratory, noninterventional study was conducted using subjects who had been implanted with an aspheric intraocular lens and had 0.5&ndash;0.75 diopter postoperative astigmatism. Monocular visual performance using full correction was compared with visual performance using spherical equivalent correction. Testing consisted of high- and low-contrast visual acuity, contrast sensitivity, and reading acuity and speed using the Radner Reading Charts.Results: Thirty-eight of 40 subjects completed testing. Visual acuities at three contrast levels (100%, 25%, and 9%) were significantly better using full correction than when using spherical equivalent correction (all P &lt; 0.001). For contrast sensitivity testing under photopic, mesopic, and mesopic with glare conditions, only one out of twelve outcomes demonstrated a significant improvement with full correction compared with spherical equivalent correction (at six cycles per degree under mesopic without glare conditions, P = 0.046). Mean reading speed was numerically faster with full correction across all print sizes, reaching statistical significance at logarithm of the reading acuity determination (logRAD) 0.2, 0.7, and 1.1 (P , 0.05). Statistically significant differences also favored full correction in logRAD score (P = 0.0376), corrected maximum reading speed (P &lt; 0.001), and logarithm of the minimum angle of resolution/logRAD ratio (P &lt; 0.001).Conclusions: In this study of pseudophakic subjects with low levels of postoperative astigmatism, full correction yielded significantly better reading performance and high- and low-contrast visual acuity than spherical equivalent correction, suggesting that cataractous patients may benefit from surgical correction of low levels of preoperative corneal astigmatism.Keywords: aspheric intraocular lens, astigmatism, cataract surgery, contrast sensitivity, reading acuity, visual acuityLehmann RPHoutman DMDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2012, Iss default, Pp 333-338 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ophthalmology RE1-994
spellingShingle	Ophthalmology RE1-994 Lehmann RP Houtman DM Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
description	Robert P Lehmann1, Diane M Houtman21Lehmann Eye Center, Nacogdoches, TX, 2Alcon Research Ltd, Fort Worth, TX, USAPurpose: To evaluate whether visual performance could be improved in pseudophakic subjects by correcting low levels of postoperative astigmatism.Methods: An exploratory, noninterventional study was conducted using subjects who had been implanted with an aspheric intraocular lens and had 0.5&ndash;0.75 diopter postoperative astigmatism. Monocular visual performance using full correction was compared with visual performance using spherical equivalent correction. Testing consisted of high- and low-contrast visual acuity, contrast sensitivity, and reading acuity and speed using the Radner Reading Charts.Results: Thirty-eight of 40 subjects completed testing. Visual acuities at three contrast levels (100%, 25%, and 9%) were significantly better using full correction than when using spherical equivalent correction (all P &lt; 0.001). For contrast sensitivity testing under photopic, mesopic, and mesopic with glare conditions, only one out of twelve outcomes demonstrated a significant improvement with full correction compared with spherical equivalent correction (at six cycles per degree under mesopic without glare conditions, P = 0.046). Mean reading speed was numerically faster with full correction across all print sizes, reaching statistical significance at logarithm of the reading acuity determination (logRAD) 0.2, 0.7, and 1.1 (P , 0.05). Statistically significant differences also favored full correction in logRAD score (P = 0.0376), corrected maximum reading speed (P &lt; 0.001), and logarithm of the minimum angle of resolution/logRAD ratio (P &lt; 0.001).Conclusions: In this study of pseudophakic subjects with low levels of postoperative astigmatism, full correction yielded significantly better reading performance and high- and low-contrast visual acuity than spherical equivalent correction, suggesting that cataractous patients may benefit from surgical correction of low levels of preoperative corneal astigmatism.Keywords: aspheric intraocular lens, astigmatism, cataract surgery, contrast sensitivity, reading acuity, visual acuity
format	article
author	Lehmann RP Houtman DM
author_facet	Lehmann RP Houtman DM
author_sort	Lehmann RP
title	Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_short	Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_full	Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_fullStr	Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_full_unstemmed	Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_sort	visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
publisher	Dove Medical Press
publishDate	2012
url	https://doaj.org/article/0fd19960a0af4321b70b921dfe04c020
work_keys_str_mv	AT lehmannrp visualperformanceincataractpatientswithlowlevelsofpostoperativeastigmatismfullcorrectionversussphericalequivalentcorrection AT houtmandm visualperformanceincataractpatientswithlowlevelsofpostoperativeastigmatismfullcorrectionversussphericalequivalentcorrection
_version_	1718396038003294208

Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction

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