Small-aperture intraocular lens tolerance to induced astigmatism

Robert Edward Ang Department of Cornea and Refractive Surgery, Asian Eye Institute, Makati City, Philippines Purpose: This prospective, single-site study aimed to assess the corresponding change in monocular visual acuity with induced astigmatic defocus in subjects implanted with a small-aperture...

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Autor principal:	Ang RE
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2018
Materias:	Multifocal Intraocular Lenses Extended Depth of Focus Lenses Refractive Errors Cataract Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/20526a995d3240d196a314fcd3b550da
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spelling	oai:doaj.org-article:20526a995d3240d196a314fcd3b550da2021-12-02T00:33:02ZSmall-aperture intraocular lens tolerance to induced astigmatism1177-5483https://doaj.org/article/20526a995d3240d196a314fcd3b550da2018-09-01T00:00:00Zhttps://www.dovepress.com/small-aperture-intraocular-lens-tolerance-to-induced-astigmatism-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Robert Edward Ang Department of Cornea and Refractive Surgery, Asian Eye Institute, Makati City, Philippines Purpose: This prospective, single-site study aimed to assess the corresponding change in monocular visual acuity with induced astigmatic defocus in subjects implanted with a small-aperture intraocular lens (IOL).Patients and methods: Ten subjects with a mean age of 65.1 years were recruited. Eleven eyes of these 10 subjects were implanted (9 unilaterally, 1 bilaterally) with an IC-8 small-aperture IOL. Baseline manifest refraction and best-corrected distance visual acuity were measured with a Snellen chart (Tumbling E chart). Astigmatic defocus was induced in the same axis as the manifest sphere-cylinder refraction or at 180° for a spherical refraction. Cylinder defocus was reduced in 0.50 D steps from -2.50 D, and distance visual acuity was measured at each level of defocus.Results: Mean distance visual acuity was 0.08 logarithm of minimum angle of resolution (logMAR) ±0.08 (20/24) at 1.50 D of defocus, 0.18 logMAR ±0.08 (20/30) at 2.00 D of defocus, and 0.24 logMAR ±0.07 (20/35) at 2.50 D of defocus. Eight out of 10 subjects achieved 20/25 or better vision with 1.50 D of cylinder defocus, and all subjects were 20/30 or better. Ten out of 11 subjects were 20/40 or better with 2.50 D of defocus.Conclusion: The IC-8 IOL shows good tolerance to astigmatic defocus with minimal effect on visual acuity. Overall, 20/25 or better distance acuity was maintained through 1.50 D cylinder defocus. Keywords: multifocal intraocular lenses, extended depth of focus lenses, refractive errors, cataractAng REDove Medical PressarticleMultifocal Intraocular LensesExtended Depth of Focus LensesRefractive ErrorsCataractOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 12, Pp 1659-1664 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Multifocal Intraocular Lenses Extended Depth of Focus Lenses Refractive Errors Cataract Ophthalmology RE1-994
spellingShingle	Multifocal Intraocular Lenses Extended Depth of Focus Lenses Refractive Errors Cataract Ophthalmology RE1-994 Ang RE Small-aperture intraocular lens tolerance to induced astigmatism
description	Robert Edward Ang Department of Cornea and Refractive Surgery, Asian Eye Institute, Makati City, Philippines Purpose: This prospective, single-site study aimed to assess the corresponding change in monocular visual acuity with induced astigmatic defocus in subjects implanted with a small-aperture intraocular lens (IOL).Patients and methods: Ten subjects with a mean age of 65.1 years were recruited. Eleven eyes of these 10 subjects were implanted (9 unilaterally, 1 bilaterally) with an IC-8 small-aperture IOL. Baseline manifest refraction and best-corrected distance visual acuity were measured with a Snellen chart (Tumbling E chart). Astigmatic defocus was induced in the same axis as the manifest sphere-cylinder refraction or at 180° for a spherical refraction. Cylinder defocus was reduced in 0.50 D steps from -2.50 D, and distance visual acuity was measured at each level of defocus.Results: Mean distance visual acuity was 0.08 logarithm of minimum angle of resolution (logMAR) ±0.08 (20/24) at 1.50 D of defocus, 0.18 logMAR ±0.08 (20/30) at 2.00 D of defocus, and 0.24 logMAR ±0.07 (20/35) at 2.50 D of defocus. Eight out of 10 subjects achieved 20/25 or better vision with 1.50 D of cylinder defocus, and all subjects were 20/30 or better. Ten out of 11 subjects were 20/40 or better with 2.50 D of defocus.Conclusion: The IC-8 IOL shows good tolerance to astigmatic defocus with minimal effect on visual acuity. Overall, 20/25 or better distance acuity was maintained through 1.50 D cylinder defocus. Keywords: multifocal intraocular lenses, extended depth of focus lenses, refractive errors, cataract
format	article
author	Ang RE
author_facet	Ang RE
author_sort	Ang RE
title	Small-aperture intraocular lens tolerance to induced astigmatism
title_short	Small-aperture intraocular lens tolerance to induced astigmatism
title_full	Small-aperture intraocular lens tolerance to induced astigmatism
title_fullStr	Small-aperture intraocular lens tolerance to induced astigmatism
title_full_unstemmed	Small-aperture intraocular lens tolerance to induced astigmatism
title_sort	small-aperture intraocular lens tolerance to induced astigmatism
publisher	Dove Medical Press
publishDate	2018
url	https://doaj.org/article/20526a995d3240d196a314fcd3b550da
work_keys_str_mv	AT angre smallapertureintraocularlenstolerancetoinducedastigmatism
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Small-aperture intraocular lens tolerance to induced astigmatism

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