Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma

Takanori Mizoguchi,1 Mineo Ozaki,2,3 Harumi Wakiyama,1,4 Nobuchika Ogino1,51Mizoguchi Eye Clinic, Nagasaki, Japan; 2Ozaki Eye Clinic Miyazaki, Japan; 3Department of Ophthalmology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan; 4The Japanese Red Cross Nagasaki Genbaku Hospital, Nagasak...

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Autores principales:	Mizoguchi T, Ozaki M, Wakiyama H, Ogino N
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2015
Materias:	Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/ac5968fad51d4f2a8abf361beef79f6f
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spelling	oai:doaj.org-article:ac5968fad51d4f2a8abf361beef79f6f2021-12-02T02:32:31ZPlateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma1177-5483https://doaj.org/article/ac5968fad51d4f2a8abf361beef79f6f2015-06-01T00:00:00Zhttp://www.dovepress.com/plateau-iris-in-japanese-patients-with-primary-angle-closure-and-prima-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Takanori Mizoguchi,1 Mineo Ozaki,2,3 Harumi Wakiyama,1,4 Nobuchika Ogino1,51Mizoguchi Eye Clinic, Nagasaki, Japan; 2Ozaki Eye Clinic Miyazaki, Japan; 3Department of Ophthalmology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan; 4The Japanese Red Cross Nagasaki Genbaku Hospital, Nagasaki, Japan; 5Nishigaki Eye Clinic, Nagoya, JapanPurpose: To determine the prevalence of plateau iris in Japanese patients with primary angle closure (PAC) and primary angle closure glaucoma (PACG) and analyze the biometric parameters in patients with plateau iris using ultrasound biomicroscopy (UBM).Methods: In this cross-sectional observational study, subjects aged >50 years with PAC and PACG who had previously undergone a patent laser peripheral iridotomy underwent UBM in one eye. UBM images were qualitatively analyzed using standardized criteria. Plateau iris in a quadrant was defined by anteriorly directed ciliary body, absent ciliary sulcus, steep iris root from its point of insertion followed by a downward angulation, flat iris plane, and irido-angle contact. At least two quadrants had to fulfill these UBM criteria for an eye to be classified as having plateau iris. A-scan biometry was used to measure anterior segment parameters.Results: Ninety-one subjects with PAC (58 subjects) or PACG (33 subjects) and 68 normal controls were recruited. The mean (standard deviation) ages of PAC and PACG patients and normal controls were 73.5 (6.2) and 72.6 (7.3), respectively. Based on UBM criteria, plateau iris was found in 16 eyes (17.6%) of 91 eyes. In these 16 eyes, quadrant-wise analysis showed ten eyes (62.5%) had plateau iris in two quadrants; four eyes (25%) had plateau iris in three quadrants; and two eyes (12.5%) had plateau iris in four quadrants. Anterior chamber depth, lens thickness, axial length, lens position, and relative lens position were not statistically significant between the group having plateau iris and that not having plateau iris, respectively.Conclusion: Approximately 20% of Japanese subjects with PAC and PACG with a patent laser peripheral iridotomy were found to have plateau iris on UBM. No morphological difference was noted in the anterior segment of the eye between those with or without plateau iris.Keywords: ultrasound biomicroscopy, biometric parameters of anterior segment, plateau iris, angle closureMizoguchi TOzaki MWakiyama HOgino NDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2015, Iss default, Pp 1159-1163 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ophthalmology RE1-994
spellingShingle	Ophthalmology RE1-994 Mizoguchi T Ozaki M Wakiyama H Ogino N Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma
description	Takanori Mizoguchi,1 Mineo Ozaki,2,3 Harumi Wakiyama,1,4 Nobuchika Ogino1,51Mizoguchi Eye Clinic, Nagasaki, Japan; 2Ozaki Eye Clinic Miyazaki, Japan; 3Department of Ophthalmology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan; 4The Japanese Red Cross Nagasaki Genbaku Hospital, Nagasaki, Japan; 5Nishigaki Eye Clinic, Nagoya, JapanPurpose: To determine the prevalence of plateau iris in Japanese patients with primary angle closure (PAC) and primary angle closure glaucoma (PACG) and analyze the biometric parameters in patients with plateau iris using ultrasound biomicroscopy (UBM).Methods: In this cross-sectional observational study, subjects aged >50 years with PAC and PACG who had previously undergone a patent laser peripheral iridotomy underwent UBM in one eye. UBM images were qualitatively analyzed using standardized criteria. Plateau iris in a quadrant was defined by anteriorly directed ciliary body, absent ciliary sulcus, steep iris root from its point of insertion followed by a downward angulation, flat iris plane, and irido-angle contact. At least two quadrants had to fulfill these UBM criteria for an eye to be classified as having plateau iris. A-scan biometry was used to measure anterior segment parameters.Results: Ninety-one subjects with PAC (58 subjects) or PACG (33 subjects) and 68 normal controls were recruited. The mean (standard deviation) ages of PAC and PACG patients and normal controls were 73.5 (6.2) and 72.6 (7.3), respectively. Based on UBM criteria, plateau iris was found in 16 eyes (17.6%) of 91 eyes. In these 16 eyes, quadrant-wise analysis showed ten eyes (62.5%) had plateau iris in two quadrants; four eyes (25%) had plateau iris in three quadrants; and two eyes (12.5%) had plateau iris in four quadrants. Anterior chamber depth, lens thickness, axial length, lens position, and relative lens position were not statistically significant between the group having plateau iris and that not having plateau iris, respectively.Conclusion: Approximately 20% of Japanese subjects with PAC and PACG with a patent laser peripheral iridotomy were found to have plateau iris on UBM. No morphological difference was noted in the anterior segment of the eye between those with or without plateau iris.Keywords: ultrasound biomicroscopy, biometric parameters of anterior segment, plateau iris, angle closure
format	article
author	Mizoguchi T Ozaki M Wakiyama H Ogino N
author_facet	Mizoguchi T Ozaki M Wakiyama H Ogino N
author_sort	Mizoguchi T
title	Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma
title_short	Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma
title_full	Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma
title_fullStr	Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma
title_full_unstemmed	Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma
title_sort	plateau iris in japanese patients with primary angle closure and primary angle closure glaucoma
publisher	Dove Medical Press
publishDate	2015
url	https://doaj.org/article/ac5968fad51d4f2a8abf361beef79f6f
work_keys_str_mv	AT mizoguchit plateauirisinjapanesepatientswithprimaryangleclosureandprimaryangleclosureglaucoma AT ozakim plateauirisinjapanesepatientswithprimaryangleclosureandprimaryangleclosureglaucoma AT wakiyamah plateauirisinjapanesepatientswithprimaryangleclosureandprimaryangleclosureglaucoma AT oginon plateauirisinjapanesepatientswithprimaryangleclosureandprimaryangleclosureglaucoma
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Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma

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