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KMID : 0893420230240040034
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Journal of Veterinary Science
2023 Volume.24 No. 4 p.34 ~ p.34
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Inter-device agreement between spectral domain optical coherence tomography, ultrasound biomicroscopy, and gonioscopy in evaluating the iridocorneal angle in normotensive dogs
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Kim Su-An
Shim Jae-Ho
Kang Seon-Mi
Seo Kang-Moon
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Abstract
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Background : There has not been a thoroughly reported study of the comparison between spectral domain-optical coherence tomography (SD-OCT) with both ultrasound biomicroscopy (UBM) and gonioscopy on the evaluation of the iridocorneal angle (ICA) in dogs.
Objectives : To investigate the diagnostic value of SD-OCT for the early detection of narrowing ICA by comparing and assessing inter-device agreement in anterior chamber angle (ACA) measurements obtained by SD-OCT and UBM, and ICA evaluations by gonioscopy.
Methods : A total of 28 eyes from 28 client-owned dogs with normal intraocular pressure were included for examination. The ACA and angle opening distance (AOD) were measured from the SD-OCT and UBM images, and gonioscopy images were analyzed using the ICA grade and ZibWest angle index.
Results : The mean ACA and AOD for SD-OCT were 28.31° ± 5.37° and 658.42 ± 219.90 μm, and for UBM, 28.34° ± 5.82° and 859.29 ± 221.80 μm, respectively. The mean difference in ACA between the average values of SD-OCT and UBM measurements was 0.03° with a 95% limit of agreement (LoA) span of 16.2°, indicating positive agreement; that in AOD was 200.85 μm with a 95% LoA span of 1,110.95 μm, indicating poor agreement. The Pearson correlation coefficient of the ACA of SD-OCT and ZibWest indices of gonioscopy was 0.624, indicating strong agreement; that of UBM and gonioscopy was 0.43, indicating moderate agreement.
Conclusions : SD-OCT is well tolerated by canine patients due to its non-contact method and might be an alternative option for early screening of ICA narrowing in clinical settings.
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KEYWORD
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Diagnosis, glaucoma, mass screening, optical imaging, therapeutics
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