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J Glaucoma. This site needs JavaScript to work properly. 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. It is now possible to examine Schwalbe's line and Schlemm's canal along with the scleral spur. Repeatability and agreement of two anterior segment OCT in myopic patients before implantable collamer lenses implantation. Elton Lik Tong Tay Department of Ophthalmology, Tan Tock Seng Hospital, Singapore 308433, Singapore ; Republic of Singapore Air Force Aeromedical Centre, Singapore 539945, Singapore. OCT imaging of the anterior segment with a longer wavelength of 131… Comparison of measurements of anterior chamber angle. 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. 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. 22 (9), 84–8 (2013) CrossRef Google Scholar With the advent of the anterior segment OCT, visualization of the scleral spur is improved. 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. Methods . 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). With three-dimensional reconstruction, visualization of the iris profiles and the angle configurations is enhanced. We use cookies to help provide and enhance our service and tailor content and ads. The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. Using a TD system, the authors were able to provide images of the anterior chamber, the chamber angle, and the lens. 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. Xu BY, Pardeshi AA, Shan J, DeBoer C, Moghimi S, Richter G, McKean-Cowdin R, Varma R. Ophthalmol Glaucoma. In recent years, OCT has become an important imaging technology used in diagnosing and following macular pathologies. 2014 Mar;25(2):98-103. doi: 10.1097/ICU.0000000000000026. Aim: To evaluate the repeatability and reproducibility of anterior chamber angle measurement obtained by anterior segment optical coherence tomography. Optical coherence tomography has several advantages over the other techniques for objective assessment of the anterior chamber angle (Dada et al 2007). The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. 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. To compare the reproducibility and agreement of anterior chamber angle (ACA) parameters and metrics obtained by four different anterior segment-optical coherence tomography (AS-OCT) devices. McKee H, Ye C, Yu M, Liu S, Lam DS, Leung CK. 2005 Aug;123(8):1053-9. doi: 10.1001/archopht.123.8.1053. Ocular Biometric Determinants of Anterior Chamber Angle Width in Chinese Americans: The Chinese American Eye Study. CKSL has received research support from Tomey and Carl Zeiss Meditec. Conversion of anterior iris bowing and angle crowding to iris straightening and angle opening after LPI was demonstrated. NIH 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/. Published by Elsevier Inc. All rights reserved. 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. 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 … Effect of Angle Narrowing on Sectoral Variation of Anterior Chamber Angle Width: The Chinese American Eye Study. This study assessed anterior chamber parameters in healthy young adults using spectral-domain optical coherence tomography. (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). Chan PP, Lai G, Chiu V, Chong A, Yu M, Leung CK. Ophthalmol Clin North Am. By continuing you agree to the use of cookies. Sci Rep. 2020 Oct 30;10(1):18771. doi: 10.1038/s41598-020-74813-3.  |  See this image and copyright information in PMC. USA.gov. Anterior chamber angle measurement with optical coherence tomography: intraobserver and interobserver variability. Arrows indicate the locations of the scleral spur. Int J Ophthalmol. Anterior chamber angle imaging with swept-source optical coherence tomography: comparison between CASIAII and ANTERION. 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 … 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). Optical coherence tomography imaging of the anterior chamber angles was performed before and after the laser procedure. Anterior chamber angle imaging with swept-source optical coherence tomography: comparison between CASIAII and ANTERION. Schwalbe's line-long arrow, scleral spur-short arrow, Schlemm's canal-. 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. 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. I.L. The interobserver variability of the PAS measurements was calculated. There was good agreement of PAS assessment between gonioscopy and OCT images (kappa = 0.79; 95% CI, 0.67–0.91). 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. Subsequent ALPI converted the plateau configuration to open angle, with normalization of IOP and disappearance of symptoms. Development in anterior segment imaging for glaucoma. Methods . doi: 10.1016/j.ohc.2005.05.007. COVID-19 is an emerging, rapidly evolving situation. The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. Wong HT, Lim MC, Sakata LM, Aung HT, Amerasinghe N, Friedman DS, Aung T. Arch Ophthalmol. 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. Xu BY, Lifton J, Burkemper B, Jiang X, Pardeshi AA, Moghimi S, Richter GM, McKean-Cowdin R, Varma R. Am J Ophthalmol. An optical coherence tomography image at the 115-degree meridian was selected for measurement of PAS (A). Please enable it to take advantage of the complete set of features! The resulting anterior chamber inflammation after laser iridotomy can be visualized as scattering reflective signals. High-definition optical coherence tomography imaging of the iridocorneal angle of the eye. Curr Opin Ophthalmol. The scleral spur (red dot) and the anterior tip of the irido-angle adhesion (green dot) were detected manually (B). 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. Forty eyes from 20 healthy, phakic individuals with open angles underwent anterior segment OCT imaging under 3 pupillary states: (1) pupil … 1 Coronavirus: Find … 2009 Mar;127(3):256-60. doi: 10.1001/archophthalmol.2009.22. Anterior chamber angle imaging with swept-source optical coherence tomography: detecting the scleral spur, Schwalbe's Line, and Schlemm's Canal. Each eye was imaged three times under room light (light intensity = 368 lux) and three times in the dark during the first visit. J Glaucoma. Would you like email updates of new search results? Francis, Y. Li, et al., Anterior chamber angle measurements using Schwalbe’s line with high resolution Fourier-domain optical coherence tomography. It has a higher image resolution than UBM, is totally noncontact, and is easily performed with minimal expertise. NCI CPTC Antibody Characterization Program. J Glaucoma. OCT has become an important tool for assessment of the anterior chamber angle and detection of angle closure. Epub 2020 Jul 28. Radhakrishnan S, Goldsmith J, Huang D, Westphal V, Dueker DK, Rollins AM, Izatt JA, Smith SD. Epub 2019 Dec 27. Arch Ophthalmol. Purpose . OCT has become an … eCollection 2020. To assess the ability of high-definition optical coherence tomography (HD-OCT) to image the anterior chamber angle. World J Clin Cases. 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. This wavelength is suboptimal for imaging the angle due to limited penetration through scattering tissue such as the sclera. Thirty-eight eyes of 24 patients with open angle glaucoma were scanned with swept source AS-OCT … Although the configuration of the iris and the angle can be examined with the Stratus OCT, the scleral spur could not be detected. The second patient presented with symptoms of intermittent angle … Improvement in image resolution and scan speed of OCT has facilitated a more detailed and comprehensive analysis of the anterior chamber angle. 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. Fourier-domain (FD) OCT instruments working at 840 nm can reliably identify fine angle structures such as the Schwalbe's line. 2020 Aug 6;8(15):3249-3258. doi: 10.12998/wjcc.v8.i15.3249. In comparison with retinal OCT, further … 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. and H.M. contributed equally to the study. 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. 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. 2020 Apr 18;13(4):625-631. doi: 10.18240/ijo.2020.04.15. 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). 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). HHS Further development enabled application of optical coherence tomography in evaluation of the integrity of the nerve fiber layer, optic nerve cupping, anterior chamber angle… OCT has become an … 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 … Optical coherence tomography (OCT) is a high resolution cross-sectional imaging modality initially developed for retinal imaging. 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 … 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 … 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. The noncontact nature of OCT not only enhances patient comfort and safety but … 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 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.  |  Optical coherence tomography (OCT) is an optical acquisition method to examine biological tissues. https://doi.org/10.1016/j.ophtha.2012.12.006. Optical coherence tomography imaging of the anterior chamber angle. B. Qin, B.A. Copyright © 2021 Elsevier B.V. or its licensors or contributors. 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]). Images were compared between healthy eyes of different age groups and patients with eyes having newly diagnosed ocular hypertension or glaucoma in different lighting … Comparison of optical coherence tomography and ultrasound biomicroscopy for detection of narrow anterior chamber angles. 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.  |  The technology of optical coherence tomography (OCT) has evolved rapidly from time-domain to spectral-domain and swept-source OCT over the recent years. Optical coherence tomography of the anterior segment - history and technical aspects. This technique reveals the spatial relationships of the ocular structures, provides high-resolution images, and results in high degrees of intraobserver and interobserver repeatabilities.

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