According to Cicero, “if the face is the mirror of the soul, the eyes are its interpreters“. They would also be indicators of our brain health. It’s less poetic, but according to a study published by the journal Nature, loss of visual sensitivity can predict dementia 12 years before it is diagnosed. Researchers analyzed data from 8,623 healthy people living in England over many years. At the start of the study, each participant took a visual sensitivity test. By the end of the study, 537 participants had developed dementia. As a reminder, Alzheimer’s disease is the best known form of dementia.
People who would develop dementia were much slower to see this triangle on the screen
For the test, they had to press a button as soon as they saw a triangle forming in a field of moving dots. People who were going to develop dementia were much slower to see this triangle on the screen. For what ? Toxic amyloid plaques associated with Alzheimer’s disease may first affect areas of the brain associated with vision, with the parts of the brain associated with memory being damaged as the disease progresses. “Vision tests can therefore detect deficits before memory tests“, summarize the scientists in The Conversation. Unfortunately, (…)
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