OCT-A Biomarker Predicts Early Glaucoma Progression

By Dr. Kevin -

A 4.9-year longitudinal study published in the American Journal of Ophthalmology suggests that microvasculature dropout (MvD) detected via OCT angiography (OCT-A) serves as a critical prognostic marker for patients with preperimetric glaucoma (optic nerve damage without initial visual field loss).

Key Study Findings

  • Faster Vascular Decline: Eyes with baseline MvD experienced a significantly faster reduction in circumpapillary capillary density compared to those without MvD (-0.88% per year vs. -0.23% per year).

  • Higher Conversion Rates: Over an average follow-up of 6.8 years, 62.5% of eyes with baseline MvD progressed to perimetric glaucoma (measurable visual field loss), compared to just 26.2% of eyes without it—a 2.5-fold higher risk.

  • Baseline Vulnerability: At the start of the study, the MvD group already exhibited lower capillary density (45.6% vs. 47.7%) and thinner retinal nerve fiber layers (RNFL) than the control group.

Clinical Takeaways

Because capillary density loss was independently tied to MvD but did not significantly correlate with immediate RNFL thinning, the authors suggest that vascular changes typically precede structural or functional decline. Utilizing OCT-A to identify baseline MvD can help clinicians risk-stratify early glaucoma patients and identify who requires closer monitoring, despite limitations like image artifacts.

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