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Year : 2022  |  Volume : 34  |  Issue : 1  |  Page : 27-31

Agreement of gonioscopy and anterior segment-optical coherence tomography in the assessment of the anterior chamber angle: A cross-sectional study

1 Department of Ophthalmology, Government Medical College, Thrissur, Kerala, India
2 Department of Ophthalmology, Government Medical College, Manjeri, Kerala, India

Correspondence Address:
Dr. P S Rekha
Assistant Professor, Department of Ophthalmology, Government Medical College, Manjeri, Malappuram, Kerala
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/kjo.kjo_91_21

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Purpose: The aim of the study was to evaluate the inter instrument agreement between gonioscopy and anterior segment optical coherence tomography (AS-OCT) in the assessment of the anterior chamber angle (ACA) in eyes with all Van Herick's grades. Methods: A single examiner performed AS-OCT and gonioscopy with a Goldman single mirror for all study patients. An angle opening distance at 500 μm from the scleral spur in the AS-OCT was considered as the quantitative parameter to assess the ACA. A closed ACA on AS-OCT was defined by the presence of any contact between the iris and angle wall anterior to scleral spur. The agreement between gonioscopy and AS-OCT of the nasal and temporal angles was estimated using the Kappa statistic and the concordance between the instruments using the Lin's concordance coefficient. Results: The mean age of the seventy participants in the study was 52.11 ± 5.37 years. Five (15.15%) of nasal angles and 4 (12.12%) of temporal angles identified as closed by gonioscopy were called as open by AS-OCT. The Kappa statistic (0.59), pairwise correlation (0.60), and Lin's concordance correlation coefficient (0.59) showed only moderate agreement and concordance between AS-OCT and gonioscopy. AS-OCT had a moderate sensitivity (73%) and better specificity (86.4%). Conclusion: The results of our study show that AS-OCT can be used as a clinical diagnostic test but has limited use as a screening test for ACA. The significant proportion of subjects with a mismatch in the categorization of open and closed ACA and the moderate agreement highlights the need for better objective diagnostic criteria for closed ACA.

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