Morphologic Analysis of Peripapillary Retinal Arteriole Using Adaptive Optics in Primary Open-angle Glaucoma

Area of Science:

• Ophthalmology
• Vascular Biology
• Medical Imaging

Background:

• Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
• The role of vascular risk factors in POAG pathogenesis requires further elucidation.
• Retinal arterial wall thickness is a potential indicator of vascular health in glaucoma.

Purpose of the Study:

• To perform a morphologic analysis of peripapillary arterioles in POAG patients using adaptive optics (AO) technology.
• To investigate the relationship between vascular risk factors and retinal arteriole morphology in POAG.
• To assess retinal arterial wall thickness and lumen diameter in POAG.

Main Methods:

• Employed adaptive optics (AO) technology for high-resolution imaging of peripapillary arterioles.
• Included healthy subjects with bilateral POAG (n=31) and a control group (n=29).
• Measured lumen diameter, wall thickness, total diameter, wall-to-lumen ratio (WLR), and cross-sectional area.

Main Results:

• POAG patients exhibited significantly lower lumen diameter (P=0.03) and total diameter (P=0.015) compared to controls.
• No significant differences were found in wall thickness, WLR, or cross-sectional area between groups.
• A higher WLR was observed in subjects with high cholesterol, but no other clinical correlations were significant.

Conclusions:

• POAG is associated with arteriolar lumen narrowing, independent of arterial wall thickness changes.
• Adaptive optics imaging provides novel insights into vascular alterations in POAG.
• Vascular risk factors in POAG appear to reduce vascular caliber rather than cause overt atherosclerosis.