The association between retinal vascular network geometry and cognitive ability in an elderly population

Area of Science:

• Ophthalmology
• Neuroscience
• Gerontology

Background:

• Cognitive decline is a major concern in aging populations.
• Retinal microvasculature is increasingly recognized for its potential as a biomarker for systemic health.
• Understanding the link between retinal vascular geometry and cognition can offer insights into brain aging.

Purpose of the Study:

• To investigate the association between retinal vascular network geometry parameters and cognitive function in elderly individuals.
• To test if specific geometric features of retinal vasculature correlate with cognitive abilities.

Main Methods:

• Fundus photography and psychometric tests (Wechsler Logical Memory, Verbal Fluency, Raven's Progressive Matrices) were performed on 321 participants (Lothian Birth Cohort 1921).
• Key retinal vascular parameters measured included branching coefficient (BC) and arteriolar bifurcation angles.
• General linear modeling (GLM) was used to analyze associations, controlling for various demographic, health, and lifestyle factors.

Main Results:

• Deviation of the median branching coefficient (BC) from optimality was significantly associated with general cognitive ability (g) and verbal fluency.
• Suboptimal angles at arteriolar bifurcations were significantly associated with logical memory performance.
• Central retinal arterial and venular equivalents (CRAE, CRVE) and arteriovenous ratio (AVR) showed no significant associations with cognitive scores.

Conclusions:

• Suboptimal retinal vascular network geometry is associated with cognitive function in older adults.
• These findings support the use of retinal microvasculature as a surrogate marker for cerebral microvasculature health.
• The study highlights the potential of ophthalmic imaging in assessing cognitive aging.