Retinal vasculature in glaucoma: a review

Area of Science:

• Ophthalmology and Vascular Biology

Background:

• Glaucoma is a leading cause of blindness globally, with complex etiology.
• While elevated intraocular pressure is a major risk factor, some patients experience vision loss despite normal pressure.
• Vascular factors are increasingly implicated in glaucoma development and progression.

Purpose of the Study:

• To review recent findings on the association between quantitative structural retinal vascular changes and glaucoma.
• To discuss the role of vascular factors in glaucoma pathogenesis.
• To explore advancements in retinal vascular imaging and future research directions.

Main Methods:

• Analysis of studies examining quantitative retinal vascular parameters (calibre, fractal dimension, tortuosity, branching angle) from retinal photographs.
• Review of population-based and clinical studies correlating these vascular changes with optic nerve damage and glaucoma.
• Inclusion of data from recent imaging techniques like optical coherence tomography angiography.

Main Results:

• Quantitative measurements of retinal vasculature, such as arteriolar narrowing and decreased fractal dimension, are associated with optic nerve damage in glaucoma.
• These findings support the vascular theory of glaucoma pathogenesis.
• Retinal nerve fibre layer thickness is also considered as a marker of optic nerve head damage.

Conclusions:

• Structural changes in retinal vasculature are significantly associated with glaucoma and optic nerve damage.
• Non-invasive assessment of retinal microcirculation offers potential for understanding glaucoma and monitoring disease progression.
• Further research into vascular imaging and its clinical implications is warranted.