Deteriorating Vision May Indicate Dementia Risk Up to 12 Years Before Diagnosis

Deteriorating results from simple vision tests may indicate an elevated risk of developing dementia more than 12 years before a formal diagnosis is made. This revelation comes from two significant studies conducted in the United Kingdom and Australia, which identified a correlation between slow processing of visual information, reduced visual acuity, and cognitive decline.

According to a report by Science Alert, which thoroughly analyzes the findings of these studies, researchers emphasize that the eyes are part of the central nervous system; thus, changes in visual metrics may reflect early processes occurring in the brain. In the UK study, which is set to take place in 2024, participants exhibiting slower processing of visual signals were more frequently diagnosed with dementia over the subsequent 12 years. Similar results were observed in the Australian study, where a decline in visual acuity emerged as a significant indicator of future cognitive decline.

Neurobiologist Nikki-Ann Wilson pointed out that vision deterioration can have various causes, many of which are treatable, such as cataracts or issues that can be corrected with glasses. Detecting such changes at an early stage and addressing them could substantially help reduce the risk of developing dementia.

A report from The Lancet commission in 2024 first indicated that vision loss in older age is a risk factor for cognitive decline, potentially accounting for up to 2.2% of dementia cases. In comparison, untreated hearing loss in middle age is associated with approximately 7% of dementia cases.

It is important to note that issues with hearing or vision are not guaranteed indicators of impending dementia. They may be symptoms of various health conditions, making such tests not entirely accurate as diagnostic tools. However, population-level studies suggest that the use of hearing aids or treatment for vision impairments may lower the risk of developing cognitive disorders.

In the Australian study, researchers analyzed data from 2,281 participants and found that vision deterioration was linked to lower scores in memory, attention, and problem-solving abilities. Part of this connection can be explained by decreased social activity, as individuals with poorer vision often avoid social gatherings due to anxiety, which may also negatively impact cognitive abilities. Maintaining social contacts could help mitigate the influence of risk factors, but further research is required.

In the UK study, over 8,000 individuals underwent a test where they pressed a button upon seeing a triangle on a screen. Participants with slower reaction times were more likely to receive a dementia diagnosis. However, it was not possible to accurately predict who would develop the disease based solely on the test results. The authors of the study believe that such assessments could be integrated into dementia risk screening alongside other cognitive tests.

Moreover, another study indicated that approximately one in five cases of dementia in older adults is associated with common vision problems. Addressing these impairments could partially reduce the risk of developing cognitive disorders.

Experts stress that dementia is a complex condition unlikely to be caused by a single factor. At the same time, the eyes are highly sensitive to age-related changes, and damage visible during retinal scans may even predict the risk of mortality. In the UK, dementia is the leading cause of death.

Experts recommend making vision screening and treatment accessible to all. They assert that addressing vision impairments presents a genuine opportunity for dementia prevention.

Legal Disclaimer: This article contains general information for reference purposes and should not be considered a substitute for medical advice. NV is not responsible for any diagnosis made by the reader based on the materials on this site. NV also bears no responsibility for the content of other internet resources linked to in this article. If you are concerned about your health, please consult a physician.