Alzheimer's is an insidious brain disease marked by a slow mental decline that can develop unnoticed for decades before symptoms arise, but hidden signs of the condition might exist much sooner.
In the new study, researchers crunched data from the long-running Dunedin Study, which has followed the lives of over 1,000 babies born in the early 1970s at one hospital in New Zealand since their birth.
However, no associations were found between retinal thinning and an overall decline in cognitive performance that might indicate something is afoot in the brain.While thinner retinal nerve fiber layers at 45 were linked to a decline in brain processing speeds since childhood, that might just be a sign of general aging, and not necessarily linked to Alzheimer's disease.Barrett-Young, who led the study.
But this is a relatively new field and results have been mixed. More research is needed to tease apart the order of events, to see whether retinal thinning actually, if the changes are secondary symptoms of the disease, or simply reflect aging or other lifestyle factors. All are possibilities.
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