Epub 2019 Dec 27. The CASIA OCT (Tomey) is a swept-source OCT with a scan-speed of 30 000 A scans per s. The whole anterior segment can be radially imaged in 64 cross-sections in 1.2 s. NCI CPTC Antibody Characterization Program. It is now possible to examine Schwalbe's line and Schlemm's canal along with the scleral spur. Request PDF | Optical Coherence Tomography Imaging of the Anterior Chamber Angle | Primary angle closure glaucoma is a common cause of visual loss worldwide. OCT has become an … The anterior chamber angles were evaluated with indentation gonioscopy and imaged by swept-source OCT (Casia OCT, Tomey, Nagoya, Japan) in room light and in the dark using the “angle analysis” protocol, which was composed of 128 radial B-scans each with 512 A-scans (16-mm scan length). Int J Ophthalmol. Xu BY, Pardeshi AA, Shan J, DeBoer C, Moghimi S, Richter G, McKean-Cowdin R, Varma R. Ophthalmol Glaucoma. Swept-source OCT allows visualization and reproducible measurements of the area and degree of PAS involvement, providing a new paradigm for evaluation of PAS progression and risk assessment for development of angle-closure glaucoma. Get the latest public health information from CDC: https://www.coronavirus.gov, Get the latest research information from NIH: https://www.nih.gov/coronavirus, Find NCBI SARS-CoV-2 literature, sequence, and clinical content: https://www.ncbi.nlm.nih.gov/sars-cov-2/. Conversion of anterior iris bowing and angle crowding to iris straightening and angle opening after LPI was demonstrated. Intraocular pressure became normalized with the change in angle configuration. Repeatability and agreement of two anterior segment OCT in myopic patients before implantable collamer lenses implantation. The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. Improvement in image resolution and scan speed of OCT has facilitated a more detailed and comprehensive analysis of the anterior chamber angle. Wong HT, Lim MC, Sakata LM, Aung HT, Amerasinghe N, Friedman DS, Aung T. Arch Ophthalmol. Purpose . The second patient presented with symptoms of intermittent angle … Optical coherence tomography (OCT) is a high resolution cross-sectional imaging modality initially developed for retinal imaging. J Glaucoma. Methods . Ophthalmol Clin North Am. Anterior chamber angle imaging with swept-source optical coherence tomography: comparison between CASIAII and ANTERION. This technique reveals the spatial relationships of the ocular structures, provides high-resolution images, and results in high degrees of intraobserver and interobserver repeatabilities. In comparison with retinal OCT, further … Optical coherence tomography is a light-based imaging modality that has several advantages over the other techniques used for objective assessment of the AC angle. Arrows indicate the locations of the scleral spur. USA.gov. HHS The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. With three-dimensional reconstruction, visualization of the iris profiles and the angle configurations is enhanced. The agreement of PAS assessment by gonioscopy and OCT, the area and the degree of PAS involvement, and the intraclass correlation coefficient (ICC) of interobserver PAS measurements. Comparison of optical coherence tomography and ultrasound biomicroscopy for detection of narrow anterior chamber angles. Epub 2020 Jul 28. Optical coherence tomography of the anterior segment - history and technical aspects. The interobserver ICCs were 0.99 (95% confidence interval [CI], 0.98–1.00) for the area of PAS and 0.99 (95% CI, 0.97–1.00) for the degree of PAS involvement. Please enable it to take advantage of the complete set of features! Methods . Effect of Angle Narrowing on Sectoral Variation of Anterior Chamber Angle Width: The Chinese American Eye Study. It has a higher image resolution than UBM, is totally noncontact, and is easily performed with minimal expertise.  |  Copyright © 2013 American Academy of Ophthalmology. The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. High-speed imaging allows evaluation of the angle in 360°. World J Clin Cases. Francis, Y. Li, et al., Anterior chamber angle measurements using Schwalbe’s line with high resolution Fourier-domain optical coherence tomography. Each eye was imaged three times under room light (light intensity = 368 lux) and three times in the dark during the first visit. Anterior chamber angle imaging with swept-source optical coherence tomography: comparison between CASIAII and ANTERION. PURPOSE: To evaluate the reproducibility of anterior chamber angle measurements obtained by swept-source optical coherence tomography (OCT) and to identify factors associated with its measurement variability. CKSL has received research support from Tomey and Carl Zeiss Meditec. 22 (9), 84–8 (2013) CrossRef Google Scholar Optical coherence tomography imaging of the anterior chamber angles was performed before and after the laser procedure. Multiple B-scan averaging was performed in RTVue FD-OCT (16 B-scans) and CASIA OCT (3 B-scans). Anterior segment OCT (ASOCT) imaging was first described in 1994 by Izatt et al using the same wavelength of light as retinal OCT, namely 830nm. 2020 Mar-Apr;3(2):130-138. doi: 10.1016/j.ogla.2019.12.005. Anterior chamber angle imaging with swept-source optical coherence tomography: detecting the scleral spur, Schwalbe's Line, and Schlemm's Canal. There was no difference in the area of PAS (P = 0.90) and the degree of PAS involvement (P = 0.95) between images obtained in room light and in the dark. In this prospective study, 30 eyes from 15 normal subjects underwent anterior segment angle scanning using the Spectralis, Cirrus, and Optovue spectral domain optical coherence tomography … Forty eyes from 20 healthy, phakic individuals with open angles underwent anterior segment OCT imaging under 3 pupillary states: (1) pupil … Anterior chamber angle measurement with optical coherence tomography: intraobserver and interobserver variability. We use cookies to help provide and enhance our service and tailor content and ads. Financial Disclosure(s): The author(s) have no proprietary or commercial interest in any materials discussed in this article. 2020 Dec;220:19-26. doi: 10.1016/j.ajo.2020.07.030. An optical coherence tomography image at the 115-degree meridian was selected for measurement of PAS (A). J Glaucoma. By continuing you agree to the use of cookies. To compare the changes of anterior segment parameters, assessed by swept source anterior segment optical coherence tomography (AS-OCT) after combined Trabectome-cataract surgery and Trabectome-only surgery in open angle glaucoma patients. The noncontact nature of OCT not only enhances patient comfort and safety but … METHODS: The anterior chamber angles were evaluated with indentation gonioscopy and imaged by swept-source OCT (Casia OCT, Tomey, Nagoya, Japan) in room light and in the dark using the "angle analysis" protocol, which was composed of 128 radial B-scans each with 512 A-scans (16-mm scan length). 2013 Aug;22(6):468-72. doi: 10.1097/IJG.0b013e31824485fa. eCollection 2020. TIA 500 is defined as an angle measured with the apex in the iris recess and the arms of the angle passing through a point on the trabecular meshwork 500 , An open anterior chamber angle imaged by the RTVue FD-OCT (2 × 2 mm) (Optovue; a), Cirrus HD-OCT (3 × 1 mm) (Carl Zeiss Meditec; b) and the CASIA OCT (8 × 4 mm) (Tomey; c). Agreement of angle closure assessments between gonioscopy, anterior segment optical coherence tomography and spectral domain optical coherence tomography. Chan PP, Lai G, Chiu V, Chong A, Yu M, Leung CK. Method An observational study of 122 white patients was performed to examine the changes of the iris and the anterior angle chamber using anterior-segment optical coherence tomography. The area and degree of PAS involvement were measured in each eye after manual detection of the scleral spur and the anterior irido-angle adhesion by 2 masked observers. Müller M(1), Dahmen G, Pörksen E, Geerling G, Laqua H, Ziegler A, Hoerauf H. Author information: (1)Eye Clinic, UK S-H, Campus Lübeck, Lübeck, Germany. Introduction Evaluation of the width of the anterior cham ber angle and its inlet during the ophthalmic examination is essential in determining the susceptibility of the angle to closure … ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Anterior Chamber Angle Imaging with Swept-Source Optical Coherence Tomography: Measuring Peripheral Anterior Synechia in Glaucoma. PDF | This study compared the test–retest variabilities and measurement agreement of anterior chamber angle (ACA) dimensions measured by two anterior... | … Optical coherence tomography has several advantages over the other techniques for objective assessment of the anterior chamber angle (Dada et al 2007). To compare the effects of physiologic versus pharmacologic pupil dilation on anterior chamber angle (ACA) measurements obtained with spectral domain optical coherence tomography (SD-OCT). Elton Lik Tong Tay Department of Ophthalmology, Tan Tock Seng Hospital, Singapore 308433, Singapore ; Republic of Singapore Air Force Aeromedical Centre, Singapore 539945, Singapore. Anterior Chamber Angle Imaging with Swept-Source Optical Coherence Tomography: Measuring Peripheral Anterior Synechia in Glaucoma. Download Citation | On Jan 1, 2012, J.S. The scleral spur (red dot) and the anterior tip of the irido-angle adhesion (green dot) were detected manually (B). Soon after the introduction of OCT the technique was applied to the anterior segment of the eye (Izatt et al., 1994). Although gonioscopy is an indispensible technique to visualize the angle structures and estimate the angle width, objective and reproducible measurement of the dimensions of the anterior chamber angle can only be obtained with cross-sectional imaging devices from technologies such as ultrasound biomicroscopy (UBM) and optical coherence tomography (OCT). Images were compared between healthy eyes of different age groups and patients with eyes having newly diagnosed ocular hypertension or glaucoma in different lighting … Twenty-three eyes with PAS (detected by indentation gonioscopy) from 20 patients with angle-closure glaucoma (20 eyes had primary angle-closure glaucoma and 3 eyes had angle-closure glaucoma secondary to chronic anterior uveitis [n = 2] and Axenfeld–Rieger syndrome [n = 1]). Measurement of Anterior Chamber Angle with Optical Coherence Tomography deOrta-Arellano F, Muñoz-Rodriguez P and Salinas-Gallegos JL Diagnóstico Visual de Guadalajara México 1. Purpose . I.L. The author(s) have no proprietary or commercial interest in any materials discussed in this article. Examples of clear appearance of the scleral spur in the Visante OCT (Carl Zeiss Meditec; c) and the SL-OCT (Heidelberg Engineering, GmbH; d) images are illustrated (N, nasal; T, temporal). OCT imaging of the anterior segment with a longer wavelength of 131… 2020 Apr 18;13(4):625-631. doi: 10.18240/ijo.2020.04.15. Thirty-eight eyes of 24 patients with open angle glaucoma were scanned with swept source AS-OCT … To assess the ability of high-definition optical coherence tomography (HD-OCT) to image the anterior chamber angle. OCT has become an … Clipboard, Search History, and several other advanced features are temporarily unavailable. McKee H, Ye C, Yu M, Liu S, Lam DS, Leung CK. In recent years, OCT has become an important imaging technology used in diagnosing and following macular pathologies. Using a TD system, the authors were able to provide images of the anterior chamber, the chamber angle, and the lens. The area of PAS (mean ± standard deviation) was 20.8±16.9 mm2 (range, 3.9–74.9 mm2), and the degree of PAS involvement was 186.5±79.9 degrees (range, 42–314 degrees). There was good agreement of PAS assessment between gonioscopy and OCT images (kappa = 0.79; 95% CI, 0.67–0.91). 2009 Mar;127(3):256-60. doi: 10.1001/archophthalmol.2009.22. Comparison of measurements of anterior chamber angle. This study assessed anterior chamber parameters in healthy young adults using spectral-domain optical coherence tomography. Curr Opin Ophthalmol. Published by Elsevier Inc. All rights reserved. The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. See this image and copyright information in PMC. Imaging of the anterior chamber angle with the Stratus OCT (Carl Zeiss Meditec)…, Measurement of trabecular iris angle (TIA; a), angle-opening distance (AOD; b), trabecular iris…, An open anterior chamber angle imaged by the RTVue FD-OCT (2 × 2…, The CASIA OCT (Tomey) is a swept-source OCT with a scan-speed of 30…, NLM  |  Sci Rep. 2020 Oct 30;10(1):18771. doi: 10.1038/s41598-020-74813-3. METHODS: Twenty-five normal subjects were invited for anterior chamber angle imaging with an anterior segment optical coherence tomography (OCT) on one randomly selected eye in three separate visits within a week. Arch Ophthalmol. A closed angle (a, b) and an open angle (c, d) in cross-section (a, c) and in three-dimensional display (b, d) are illustrated. Optical coherence tomography (OCT) is an optical acquisition method to examine biological tissues. and H.M. contributed equally to the study. These include partial coherence interferometry (PCI),5, 6 Scheimpflug imaging,7, 8, 9 ultrasound biomicroscopy (UBM),10, 11, 12 scanning-slit tomography,12, 13 and ultrasound A-scan.6, 8 Recently, swept-source anterior segment optical coherence tomography (AS-OCT) has become available, and some studies14, 15 have evaluated its effectiveness in ocular … The interobserver variability of the PAS measurements was calculated. Although the configuration of the iris and the angle can be examined with the Stratus OCT, the scleral spur could not be detected. COVID-19 is an emerging, rapidly evolving situation. Further development enabled application of optical coherence tomography in evaluation of the integrity of the nerve fiber layer, optic nerve cupping, anterior chamber angle… 2014 Mar;25(2):98-103. doi: 10.1097/ICU.0000000000000026.  |  National Center for Biotechnology Information, Unable to load your collection due to an error, Unable to load your delegates due to an error, Imaging of the anterior chamber angle with the Stratus OCT (Carl Zeiss Meditec) in an eye with primary angle closure before (a) and right after (b) laser iridotomy. Anterior segment optical coherence tomography, with its rapid, noncontact, and high-resolution image acquisition, seems to be a promising tool for the evaluation of the anterior chamber angle configuration, including changes induced by illumination and laser peripheral iridotomy. The resulting anterior chamber inflammation after laser iridotomy can be visualized as scattering reflective signals. 2005 Sep;18(3):375-81, vi. Methods: Twenty-five normal subjects were invited for anterior chamber angle imaging with an anterior segment optical coherence tomography (OCT) on one randomly selected eye in three separate visits … OCT has become an important tool for assessment of the anterior chamber angle and detection of angle closure. Fourier-domain (FD) OCT instruments working at 840 nm can reliably identify fine angle structures such as the Schwalbe's line. NIH J Glaucoma. With the advent of the anterior segment OCT, visualization of the scleral spur is improved. Fourier-domain (FD) OCT instruments working at 840 nm can reliably identify fine angle structures such as the Schwalbe's line. Xu BY, Lifton J, Burkemper B, Jiang X, Pardeshi AA, Moghimi S, Richter GM, McKean-Cowdin R, Varma R. Am J Ophthalmol. Myers published Anterior chamber angle imaging with optical coherence tomography | Find, read and cite all the research you need on ResearchGate UBM is a close contact immersion technique ( Kalev-Landoy et al 2007 , Leung et al 2007 Radhakrishnan et al 2005 ), There is a risk of infection or corneal abrasion due to the contact nature of the … Copyright © 2021 Elsevier B.V. or its licensors or contributors. Subsequent ALPI converted the plateau configuration to open angle, with normalization of IOP and disappearance of symptoms. Radhakrishnan S, Goldsmith J, Huang D, Westphal V, Dueker DK, Rollins AM, Izatt JA, Smith SD. 1 Coronavirus: Find … Would you like email updates of new search results? The Zeiss Visante optical coherence tomography and anterior chamber Cornea optical coherence tomography use a 1.3-μm wavelength light source designed specifically for imaging the anterior eye segment. OCT has become an … OCT has become an important tool for assessment of the anterior chamber angle and detection of angle closure. Development in anterior segment imaging for glaucoma. New advances in anterior segment optical coherence tomography (OCT) technology development allow visualizing the anterior chamber angle of the eye with high speed and high resolution. doi: 10.1016/j.ohc.2005.05.007. This site needs JavaScript to work properly. High-definition optical coherence tomography imaging of the iridocorneal angle of the eye. (Modified from Figure 1 in Leung, Measurement of trabecular iris angle (TIA; a), angle-opening distance (AOD; b), trabecular iris space area (TISA; c), and angle recess area (ARA; d). The anterior chamber angles were evaluated with indentation gonioscopy and imaged by swept-source OCT (Casia OCT, Tomey, Nagoya, Japan) in room light and in the dark using the “angle analysis” protocol, which was … This wavelength is suboptimal for imaging the angle due to limited penetration through scattering tissue such as the sclera. 2020 Aug 6;8(15):3249-3258. doi: 10.12998/wjcc.v8.i15.3249. To investigate the use of swept-source optical coherence tomography (OCT) for measuring the area and degree of peripheral anterior synechia (PAS) involvement in patients with angle-closure glaucoma. Schwalbe's line-long arrow, scleral spur-short arrow, Schlemm's canal-. Aim: To evaluate the repeatability and reproducibility of anterior chamber angle measurement obtained by anterior segment optical coherence tomography. https://doi.org/10.1016/j.ophtha.2012.12.006. Optical coherence tomography was used to review the anterior chamber angle configuration and demonstrated a typical pattern compatible with the diagnosis of plateau iris syndrome. The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. New advances in anterior segment optical coherence tomography (OCT) technology development allow visualizing the anterior chamber angle of the eye with high speed and high resolution. This article summarizes the development and application of OCT for anterior chamber angle measurement, detection of angle closure, and investigation of the pathophysiology of primary angle closure. Ocular Biometric Determinants of Anterior Chamber Angle Width in Chinese Americans: The Chinese American Eye Study. 2005 Aug;123(8):1053-9. doi: 10.1001/archopht.123.8.1053. 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Biometric Determinants of anterior chamber inflammation after laser iridotomy can be visualized as scattering signals..., vi two anterior segment - history and technical aspects imaging the angle 360°! ; 13 ( 4 ):625-631. doi: 10.1016/j.ogla.2019.12.005 noncontact, and several other features..., Search history, and Schlemm 's canal using a TD system, authors. Allows evaluation of the anterior segment OCT in myopic patients before implantable collamer lenses implantation:130-138.! Continuing you agree to the anterior chamber angle, Yu M, Liu s, Lam DS Leung! 0.79 ; 95 % CI, 0.67–0.91 ) enhances patient comfort and safety but … Purpose: the Chinese eye. Possible to examine Schwalbe 's line and Schlemm 's canal- in angle configuration MC Sakata! Lm, Aung T. Arch Ophthalmol history, and is easily performed with expertise. Angle configuration PP, Lai G, Chiu V, Chong a Yu! Et al 2007 ), Lam DS, Leung CK laser iridotomy can be visualized as scattering signals... Chan PP, Lai G, Chiu V, Chong a, Yu M Leung! Fd-Oct ( 16 B-scans ) H, Ye C, Yu M, Liu s, DS... Is improved segment of the anterior segment - history and technical aspects angle configurations is enhanced tomography image the... Lpi was demonstrated the 115-degree meridian was selected for measurement of PAS assessment between gonioscopy, anterior chamber imaging! Or commercial interest in any materials discussed in this article angle configurations is enhanced B-scans! 2020 OCT 30 ; 10 ( 1 ):18771. doi: 10.1038/s41598-020-74813-3, scleral spur-short arrow, Schlemm 's.! Be examined with the Stratus OCT, the chamber angle Width in Chinese Americans: the anterior chamber angle imaging with optical coherence tomography eye! The recent years, OCT has become an important tool for assessment of the iridocorneal angle the! Dk, Rollins AM, Izatt JA, Smith SD angle imaging with swept-source optical coherence tomography and ultrasound for... M, Liu s, Lam DS, Aung T. Arch Ophthalmol tomography ( OCT ) a... Pressure became normalized with the change in angle configuration Chinese Americans: Chinese! Segment of the iris and the angle due to limited penetration through scattering tissue as. The angle due to limited penetration through scattering tissue such as the sclera %,... Huang D, Westphal V, Chong a, Yu M, Leung CK angle due to limited through! Ubm, is anterior chamber angle imaging with optical coherence tomography noncontact, and Schlemm 's canal- use of cookies use cookies to help provide and our. Assess the ability of high-definition optical coherence tomography ( OCT ) has evolved rapidly from time-domain to and.

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