Characterization of Prelaminar Wedge-Shaped Defects in Primary Open-Angle Glaucoma

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Research

Background:

• Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
• Accurate detection of early glaucomatous damage is crucial for timely intervention.
• Swept-source optical coherence tomography (SS-OCT) offers high-resolution imaging of the optic nerve head.

Purpose of the Study:

• To evaluate the clinical significance of prelaminar wedge defects (PLWDs) identified via SS-OCT in POAG patients.
• To determine if PLWDs are associated with specific clinical characteristics in POAG.

Main Methods:

• Retrospective case-control study comparing POAG eyes (n=40) with control eyes (n=23).
• PLWDs defined as triangular defects on SS-OCT scans, assessed by masked observers.
• Analysis included disc hemorrhage history, lamina cribrosa defects, and multivariable logistic regression.

Main Results:

• PLWDs were significantly more prevalent in POAG eyes (27.5%) than controls (4.3%, p=0.04).
• POAG eyes with PLWDs showed a higher incidence of prior disc hemorrhage (45.5% vs 3.4%, p=0.004) and lamina cribrosa defects (45.5% vs 3.4%, p=0.01).
• PLWDs were independently associated with increased odds of disc hemorrhage (OR=21.6) and lamina cribrosa defects (OR=44.8).

Conclusions:

• Prelaminar wedge defects (PLWDs) are more frequent in primary open-angle glaucoma (POAG) eyes.
• PLWDs are associated with a history of disc hemorrhage and lamina cribrosa abnormalities.
• PLWDs represent a potential imaging biomarker for detecting glaucomatous damage.