Observational studyBMC ophthalmology2026
Quadrant-specific assessment of anterior chamber angles in primary angle-closure suspects using anterior segment-OCT: a cross-sectional observational study.
Observational study in BMC ophthalmology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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17 authors.
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Abstract
backgroundPrimary angle-closure glaucoma (PACG) is a leading cause of irreversible blindness in Asian populations. However, the topographic distribution of angle narrowing across different quadrants remains incompletely characterized in primary angle-closure suspects (PACS), and routine clinical assessments often rely solely on horizontal scans. The study aims to identify the narrowest anterior chamber angle quadrant in PACS using Anterior Segment Optical Coherence Tomography (AS-OCT).
methodsIn this community-based cross-sectional study, 218 right eyes of 218 PACS subjects were recruited. All participants underwent standardized questionnaire surveys and ophthalmic examinations. AS-OCT parameters including angle opening distance (AOD), trabecular iris space area (TISA) and trabecular iris angle (TIA) were measured at 500 μm from the sclera spur (SS) in the superior, inferior, nasal and temporal quadrants. As iridotrabecular contact (ITC) in more than one quadrant precluded identification of the narrowest quadrant, only narrow-angle eyes (ITC in < 2 quadrants) were included in the analysis. Quadrant-wise comparisons and multivariate linear regression analyses were performed.
resultsSignificant differences in angle width were observed across all four quadrants (P<0.001 for AOD500, TISA500, and TIA500). The superior quadrant exhibited the narrowest angle, followed by the inferior, nasal, and temporal quadrants in narrow-angle eyes. Multivariate linear regression analysis revealed that superior anterior chamber volume (ACV- superior)was positively associated (P<0.001), while superior iris thickness at 750 μm (IT750-superior) was negatively associated (P = 0.049) to superior AOD500.
conclusionThe superior quadrant is consistently the narrowest in PACS eyes, highlighting the necessity of including vertical cross-sectional scans in routine AS-OCT examination protocols for this population.
trial registrationThe study was registered in the Chinese Clinical Trial Registry on September 4th, 2020 (Registration Number: ChiCTR2000037944).
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