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Updated: Jun 20, 2026

Using Retinal Imaging to Study Dementia
Published on: November 6, 2017
Retinal microvascular signs and cognitive impairment.
Gerald Liew1, Paul Mitchell, Tien Yin Wong
1Centre for Vision Research, University of Sydney, Sydney, Australia.
Retinal microvascular signs, like dilated venules, are linked to cognitive impairment. This association is stronger in hypertensive individuals, suggesting cerebral microvascular changes contribute to cognitive decline.
Area of Science:
- Ophthalmology
- Neurology
- Geriatrics
Background:
- Cerebral microvascular disease is a significant factor in cognitive impairment.
- Retinal microvascular signs serve as a potential indicator of cerebral microvascular changes.
Purpose of the Study:
- To investigate the association between retinal microvascular signs and cognitive impairment.
- To explore if retinal signs predict cognitive decline, especially in hypertensive individuals.
Main Methods:
- A cross-sectional population-based study involving 1,988 participants aged 49-97.
- Retinal photography and Mini-Mental State Examination (MMSE) were used to assess retinopathy, vessel caliber, and cognitive function.
- Cognitive impairment was defined as an MMSE score of 23 or less.
Main Results:
- Cognitive impairment was identified in 6.1% of participants.
- Retinal venular dilation showed a significant association with cognitive impairment (OR=1.8).
- In hypertensive participants, retinopathy signs (OR=1.7) and venular dilation (OR=2.7) were significantly linked to cognitive impairment.
Conclusions:
- Retinal microvascular signs are associated with significant cognitive impairment.
- The link between retinal signs and cognitive impairment is particularly pronounced in older individuals with hypertension.
- These findings support the hypothesis that cerebral microvascular changes contribute to cognitive deterioration.
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