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      Intradevice Repeatability and Interdevice Agreement of Ocular Biometric Measurements: A Comparison of Two Swept-Source Anterior Segment OCT Devices

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          Abstract

          Purpose

          To assess the repeatability and agreement of ocular biometric parameters measured using the Tomey CASIA SS-1000 and Heidelberg ANTERION anterior segment optical coherence tomography (AS-OCT) devices.

          Methods

          Both eyes of subjects 18 years of age or older were scanned three times with the CASIA and ANTERION under standardized dark lighting. One AS-OCT image along the horizontal (temporal-nasal) meridian was analyzed per eye and per scan. Pupillary diameter (PD) was within 15% for all pairwise comparisons. Anterior chamber depth, lens vault, anterior chamber width, angle opening distance, trabecular iris space area, and scleral spur angle (SSA500) were measured using manufacturer-provided image analysis software. Intraclass correlation (ICC), Wilcoxon signed-rank, and Bland-Altman analyses were performed to assess intradevice repeatability and interdevice agreement of measurements.

          Results

          Thirty-two eyes of 21 subjects were analyzed. There was excellent agreement (ICC >0.98) and no significant difference ( P > 0.05) in PD across all comparisons. Intradevice measurement repeatability was excellent for both the CASIA (ICC range 0.93–0.99) and ANTERION (ICC range 0.97–0.99). Interdevice measurement agreement was also excellent (ICC range 0.85–0.96). Measurements within and between devices were similar ( P > 0.06) for all parameters except SSA500 ( P = 0.03). Linear regression and Bland-Altman plots showed the relationship was consistent across the entire range of measurements.

          Conclusions

          Intradevice measurement repeatability is excellent for the CASIA and ANTERION. Interdevice measurement agreement between the two devices exceeds metrics reported by previous comparison studies.

          Translational Relevance

          Modern swept-source AS-OCT devices produce highly repeatable measurements of ocular biometric parameters that are nearly interchangeable across devices.

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          Most cited references23

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          Anterior segment optical coherence tomography

          Marcus Ang, Mani Baskaran, René Werkmeister … (2018)
          Optical coherence tomography (OCT) provides non-contact, rapid in vivo imaging of ocular structures, and has become a key part of evaluating the anterior segment of the eye. Over the years, improvements to technology have increased the speed of capture and resolution of images, leading to the increasing impact of anterior segment OCT imaging on clinical practice. In this review, we summarize the historical development of anterior segment OCT, and provide an update on the research and clinical applications of imaging the ocular surface, cornea, anterior chamber structures, aqueous outflow system, and most recently anterior segment vessels. We also describe advancements in anterior segment OCT technology that have improved understanding with greater detail, such as tear film in dry eye disease evaluation, intra-operative real-time imaging for anterior segment surgery, and aqueous outflow with angle assessment for glaucoma. Improvements to image processing and software have also improved the ease and utility of interpreting anterior segment OCT images in everyday clinical practice. Future developments include refinement of assessing vascular networks for the anterior segment, in vivo ultra-high resolution anterior segment optical coherence tomography with histology-like detail, en-face image with 3-dimensional reconstruction as well as functional extensions of the technique.
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            Laser peripheral iridotomy for the prevention of angle closure: a single-centre, randomised controlled trial

            Mingguang He, Yuzhen Jiang, Shengsong Huang … (2019)
            Primary angle-closure glaucoma affects 20 million people worldwide. People classified as primary angle closure suspects have a higher but poorly quantified risk of developing glaucoma. We aimed to assess efficacy and safety of laser peripheral iridotomy prophylaxis against primary angle-closure glaucoma in Chinese people classified as primary angle closure suspects.
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              Quantitative iris parameters and association with narrow angles.

              Bingsong Wang, Lisandro Sakata, David Friedman … (2010)
              To investigate the relationship between quantitative iris parameters (iris curvature [I-Curv], iris area [I-Area], and iris thickness) and the presence of narrow angles. Cross-sectional, community-based study. We recruited 2047 subjects >50 years old without ophthalmic symptoms from a community clinic in Singapore. All subjects underwent gonioscopy and anterior segment optical coherence tomography (AS-OCT) under dark conditions. An eye was considered to have narrow angles if the posterior pigmented trabecular meshwork was not visible for >/=180 degrees on nonindentation gonioscopy with the eye in the primary position. Customized software was used on horizontal AS-OCT scans to measure I-Curv, I-Area, and iris thickness 750 mum (IT750) and 2000 mum (IT2000) from the scleral spur. The average of both temporal and nasal measured values of the right eye was used for analysis. The association between iris parameters and narrow angles on gonioscopy. Iris parameters from 1465 eyes (71.6%) were available for analysis. Of these, 315 subjects (21.5%) had narrow angles. The mean I-Curv (0.366 vs 0.259 mm; P /=60 years had stronger associations for most iris parameters with narrow angles than men and younger subjects. Quantitative iris parameters (I-Curv, I-Area, and iris thickness) are independently associated with narrow angles, particularly in women and older subjects. These data provide further insights into the pathogenesis of angle closure in Singaporeans. Proprietary or commercial disclosure may be found after the references. Copyright 2010 American Academy of Ophthalmology. Published by Elsevier Inc. All rights reserved.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Transl Vis Sci Technol
                Journal ID (iso-abbrev): Transl Vis Sci Technol
                Journal ID (pmc): tvst
                Journal ID (publisher-id): TVST
                Title: Translational Vision Science & Technology
                Publisher: The Association for Research in Vision and Ophthalmology
                ISSN (Electronic): 2164-2591
                Publication date (Electronic): 07 August 2020
                Publication date Collection: August 2020
                Volume: 9
                Issue: 9
                Electronic Location Identifier: 14
                Affiliations
                [1 ]USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine at the University of Southern California, Los Angeles, CA, USA
                [2 ]Eye Hospital of China Academy of Chinese Medical Sciences, Beijing, China
                [3 ]Doheny Eye Institute and Department of Ophthalmology, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, CA, USA
                Author notes
                Correspondence: Benjamin Y. Xu, Department of Ophthalmology, Keck School of Medicine at the University of Southern California, 1450 San Pablo Street, 4th Floor, Suite 4700, Los Angeles, CA 90033, USA. e-mail: benjamin.xu@ 123456med.usc.edu
                Article
                Publisher ID: TVST-20-2398
                DOI: 10.1167/tvst.9.9.14
                PMC ID: 7442878
                PubMed ID: 32879770
                SO-VID: d8f6f065-391c-4871-811b-bb0120d6a0b0
                Copyright © Copyright 2020 The Authors
                License:

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                Date accepted : 12 June 2020
                Date received : 02 March 2020
                Page count
                Pages: 9
                Categories
                Subject: Article
                Subject: Article

                Keywords: primary angle closure disease,anterior segment oct,swept source oct,ocular biometric measurements
                Data availability:
                Keywords: primary angle closure disease, anterior segment oct, swept source oct, ocular biometric measurements

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