Structure-Function Relationships and Glaucoma Detection with Magnification Correction of OCT Angiography

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Research

Background:

• Optical Coherence Tomography (OCT) angiography is vital for visualizing ocular vasculature.
• Accurate vascular density (VD) measurements are essential for understanding glaucoma pathophysiology.
• Ocular magnification can influence imaging metrics, necessitating correction for precise analysis.

Purpose of the Study:

• To evaluate the impact of ocular magnification adjustment on structure-function relationships in glaucoma.
• To determine if magnification correction improves glaucoma detection using OCT angiography.
• To investigate the association between axial length, VD, and glaucoma status with and without magnification correction.

Main Methods:

• A cross-sectional study included 96 healthy controls and 90 open-angle glaucoma patients.
• Swept-source OCT angiography quantified macular and circumpapillary vascular density (VD).
• Structure-function relationships were assessed using correlation analyses and receiver operating characteristic (ROC) curves with and without magnification correction.

Main Results:

• Magnification correction revealed a significant negative correlation between axial length and macular VD (r = -0.22, P = 0.028).
• Without correction, circumpapillary VD correlated with axial length (r = -0.22, P = 0.031), but this significance was lost with correction.
• Glaucoma diagnostic accuracy (AUC) for both macular and circumpapillary regions did not significantly improve after magnification correction.

Conclusions:

• Ocular magnification adjustment is important for accurate vascular density (VD) measurements in OCT angiography.
• While critical for VD, magnification correction demonstrated limited impact on structure-function relationships and glaucoma detection accuracy.
• Further research may be needed to fully elucidate the role of magnification correction in glaucoma assessment.