Health · Medical Research · 2 hrs ago
Worsening vision linked to higher dementia risk in 16-year study
Researchers followed 15,576 adults aged 65 and older in Hong Kong for up to 16 years.
They compared participants’ eyesight over time with whether they later developed dementia.
About 3,643 participants developed dementia during the study.
Moderate to severe vision impairment was associated with a higher risk, and faster vision loss added to the association among people with poorer eyesight.
People with severe impairment had an estimated 2.1 fewer years without dementia than those with normal vision.
The researchers excluded dementia cases from the first six years in one analysis to reduce the chance that early, undetected dementia explained the link.
The study shows an association, not that vision loss causes dementia or that correcting eyesight can prevent it.
A 16-year study of 15,576 older adults in Hong Kong found that moderate to severe visual impairment was associated with higher dementia risk.
Faster vision decline added to the association among people with poorer visual acuity.
Severe visual impairment was linked to an estimated 2.1 fewer dementia-free years than normal vision over the study period.
The findings suggest vision may help identify older adults who need closer monitoring, but they do not show that correcting vision prevents dementia.
- Who
- Researchers studied 15,576 community-dwelling Chinese adults aged 65 or older.
- What
- The study examined links between visual impairment and later dementia risk.
- When
- Participants were followed for up to 16 years.
- Where
- Hong Kong, at 18 government Elderly Health Centers.
- Why
- Researchers investigated whether the severity and progression of vision loss could help identify older adults at higher dementia risk.
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Researchers enrolled participants who were clinically confirmed to be free of dementia and assessed their visual acuity.
The final analysis assessed dementia cases during this period after excluding cases from the first six years and participants whose dementia-free status at year six could not be confirmed.
- Participants
- 15,576 community-dwelling adults aged 65 or older
- Study location
- Hong Kong
- Follow-up
- Up to 16 years
- Dementia cases
- 3,643 participants, or 23.4%, developed dementia during 168,434 person-years of follow-up
- Severe visual impairment
- Linked to an estimated 2.1 fewer dementia-free years than normal vision
Sources
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