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EVALUATION OF ANTERIOR SEGMENT STRUCTURE USING AS-OCT IN PATIENTS WITH PRIMARY ANGLE-CLOSURE GLAUCOMA
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Abstract
Introduction: Anterior segment structures play a crucial role in the pathogenesis of primary angle-closure glaucoma. Anterior segment optical coherence tomography (AS-OCT) is a non-invasive imaging modality that allows accurate evaluation of these parameters. Objective: To evaluate anterior segment morphology using AS-OCT in patients with primary angle-closure glaucoma. Subjects and Methods: This cross-sectional descriptive study included 34 eyes from patients diagnosed with primary angle-closure glaucoma and coexisting cataract. Anterior segment parameters were measured using AS-OCT on 0° and 90° meridians. Visual acuity and intraocular pressure (IOP) were recorded at the time of imaging. Results: The mean anterior chamber depth (ACD) was 1.95 ± 0.23 mm, reflecting shallow anterior chambers in most patients. The mean anterior chamber area (ACA) was 13.42 ± 1.91 mm². The mean trabecular–iris angle (TIA) was 13.41 ± 4.61°. The mean angle opening distance at 500 μm (AOD500) was 197.41 ± 40.9 μm, significantly lower than normal values. Clinically, the mean preoperative IOP was 26.81 ± 13.14 mmHg. The mean best-corrected visual acuity (logMAR) was 0.69 ± 0.68. IOP showed a negative correlation with ACD, ACA, TIA, and AOD, and a positive correlation with iris curvature (IC). Conclusion: AS-OCT is an effective, objective, and noninvasive imaging modality for evaluating anterior segment structures. IOP is strongly correlated with anterior chamber parameters in primary angle-closure glaucoma.
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Keywords
AS-OCT, primary angle-closure glaucoma, anterior chamber angle.
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