Bifocal contact lenses: History, types, characteristics, and actual state and problems

Hiroshi Toshida, Kozo Takahashi, Kazushige Sado, Atsushi Kanai, Akira MurakamiDepartment of Ophthalmology, Juntendo University School of Medicine, Tokyo, JapanAbstract: Since people who wear contact lenses (CL) often continue using CL even when they develop presbyopia, there are growing expectations...

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Autores principales:	Hiroshi Toshida, Kozo Takahashi, Kazushige Sado, Atsushi Kanai, Akira Murakami
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2008
Materias:	Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/9b043451378a4cb9b0a1635deb835a9e
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spelling	oai:doaj.org-article:9b043451378a4cb9b0a1635deb835a9e2021-12-02T07:48:55ZBifocal contact lenses: History, types, characteristics, and actual state and problems1177-54671177-5483https://doaj.org/article/9b043451378a4cb9b0a1635deb835a9e2008-07-01T00:00:00Zhttp://www.dovepress.com/bifocal-contact-lenses-history-types-characteristics-and-actual-state--a1711https://doaj.org/toc/1177-5467https://doaj.org/toc/1177-5483Hiroshi Toshida, Kozo Takahashi, Kazushige Sado, Atsushi Kanai, Akira MurakamiDepartment of Ophthalmology, Juntendo University School of Medicine, Tokyo, JapanAbstract: Since people who wear contact lenses (CL) often continue using CL even when they develop presbyopia, there are growing expectations for bifocal CL. To understand actual state and problems, history, types, and their characteristics are summarized in this review. Bifocal CL have a long history over 70 years. Recently, bifocal CL have achieved remarkable progress. However, there still is an impression that prescription of bifocal CL is not easy. It should also be remembered that bifocal CL have limits, including limited addition for near vision, as well as the effects of aging and eye diseases in the aged, such as dry eye, astigmatism, cataract, etc. Analysis of the long-term users of bifocal CL among our patients has revealed the disappearance of bifocal CL that achieved unsatisfactory vision and poor contrast compared with those provided by other types of CL. Changing the prescription up to 3 times for lenses of the same brand may be appropriate. Lenses that provide poor contrast sensitivity, suffer from glare, or give unsatisfactory vision have been weeded out. The repeated replacement of products due to the emergence of improved or new products will be guessed.Keywords: bifocal contact lens, presbyopia, accommodation Hiroshi ToshidaKozo TakahashiKazushige SadoAtsushi KanaiAkira MurakamiDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2008, Iss Issue 4, Pp 869-877 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ophthalmology RE1-994
spellingShingle	Ophthalmology RE1-994 Hiroshi Toshida Kozo Takahashi Kazushige Sado Atsushi Kanai Akira Murakami Bifocal contact lenses: History, types, characteristics, and actual state and problems
description	Hiroshi Toshida, Kozo Takahashi, Kazushige Sado, Atsushi Kanai, Akira MurakamiDepartment of Ophthalmology, Juntendo University School of Medicine, Tokyo, JapanAbstract: Since people who wear contact lenses (CL) often continue using CL even when they develop presbyopia, there are growing expectations for bifocal CL. To understand actual state and problems, history, types, and their characteristics are summarized in this review. Bifocal CL have a long history over 70 years. Recently, bifocal CL have achieved remarkable progress. However, there still is an impression that prescription of bifocal CL is not easy. It should also be remembered that bifocal CL have limits, including limited addition for near vision, as well as the effects of aging and eye diseases in the aged, such as dry eye, astigmatism, cataract, etc. Analysis of the long-term users of bifocal CL among our patients has revealed the disappearance of bifocal CL that achieved unsatisfactory vision and poor contrast compared with those provided by other types of CL. Changing the prescription up to 3 times for lenses of the same brand may be appropriate. Lenses that provide poor contrast sensitivity, suffer from glare, or give unsatisfactory vision have been weeded out. The repeated replacement of products due to the emergence of improved or new products will be guessed.Keywords: bifocal contact lens, presbyopia, accommodation
format	article
author	Hiroshi Toshida Kozo Takahashi Kazushige Sado Atsushi Kanai Akira Murakami
author_facet	Hiroshi Toshida Kozo Takahashi Kazushige Sado Atsushi Kanai Akira Murakami
author_sort	Hiroshi Toshida
title	Bifocal contact lenses: History, types, characteristics, and actual state and problems
title_short	Bifocal contact lenses: History, types, characteristics, and actual state and problems
title_full	Bifocal contact lenses: History, types, characteristics, and actual state and problems
title_fullStr	Bifocal contact lenses: History, types, characteristics, and actual state and problems
title_full_unstemmed	Bifocal contact lenses: History, types, characteristics, and actual state and problems
title_sort	bifocal contact lenses: history, types, characteristics, and actual state and problems
publisher	Dove Medical Press
publishDate	2008
url	https://doaj.org/article/9b043451378a4cb9b0a1635deb835a9e
work_keys_str_mv	AT hiroshitoshida bifocalcontactlenseshistorytypescharacteristicsandactualstateandproblems AT kozotakahashi bifocalcontactlenseshistorytypescharacteristicsandactualstateandproblems AT kazushigesado bifocalcontactlenseshistorytypescharacteristicsandactualstateandproblems AT atsushikanai bifocalcontactlenseshistorytypescharacteristicsandactualstateandproblems AT akiramurakami bifocalcontactlenseshistorytypescharacteristicsandactualstateandproblems
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Bifocal contact lenses: History, types, characteristics, and actual state and problems

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