A US study of people with mild cognitive impairment compared dementia risk by vision status. Those with no vision impairment, or with impairment that had been corrected, had a lower risk of progressing to dementia than those whose vision impairment was uncorrected. The association was stronger in people under 75.
The abstract available does not report the size of the effect, the number of participants or the follow-up, so the strength of the finding cannot be judged from it.
The idea is plausible: poor vision limits activity, reading and social contact, all of which may support cognition. Correcting vision is also cheap and low-risk, which makes it worth doing whether or not it changes dementia risk.
This is an association. It does not show that correcting vision prevents dementia, and people who get their vision corrected may differ in other ways.
- Check vision and whether glasses are current in anyone with mild cognitive impairment.
- Refer for cataract assessment or refraction where vision is impaired.
- The association was stronger in people under 75.
- Correct vision for its own sake; any effect on dementia is unproven.
Why it matters
A pair of glasses or a cataract operation is among the simplest interventions in a memory clinic.
Don't overread it
This was observational, and the abstract gives no effect size; it cannot show that correcting vision prevents dementia.
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