Eye exams in aging adults may catch more than just vision problems. A new study bolsters evidence that certain types of vision problems may point to an elevated risk of dementia.

Doctors recommends all healthy adults get a baseline eye exam with an ophthalmologist by age 40. Seniors over the age of 65 should see an ophthalmologist every one to two years.

This study should strengthen our desire to protect the eyes as we age. Doing so benefits our overall health, and may also help protect our cognitive health.

Doctors have long observed a link between vision loss and cognitive decline. Many studies have shown that older adults with impaired vision have twice the risk of developing conditions like dementia and Alzheimers disease. A sweeping study of 1,200 adults strengthens the evidence for this link. Researchers monitored the vision of adults with dementia for 16 years, checking for three different types of vision loss. They also measured the adults’ language, memory, attention and various measures of mental agility, including the abilities to plan, pay attention, remember instructions and juggle multiple tasks. Here’s what the new study found: people with the worst visual acuity had the greatest risk of declining language and memory. Those who had difficulty detecting objects set against similar-colored backgrounds, also known as contrast sensitivity, had higher risks of declining language, memory, attention and visuospatial ability.

Common causes of visual decline include macular degeneration, glaucoma and cataracts. It’s possible that certain health conditions affect both vision and cognition. Or that vision loss contributes to depression or social isolation, which could in turn affect cognition. A recent study from South Korea found that people with impairments in both vision and hearing are twice as likely to develop dementia as people with only one or neither impairment.

But the new findings do reveal one important thing: the importance of regular eye exams for seniors. Not only can eye exams help catch vision loss early — they may also help identify seniors at risk of dementia.

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