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Home Headline

Eye exam may predict Alzheimer’s

Georgia Asian Times by Georgia Asian Times
August 24, 2018
in Headline, Health
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Using equipment similar to the kind already available at most eye doctors’ offices, researchers detected signs of Alzheimer’s in a small sample of 30 people, according to a study published in the Journal of the American Medical Association (JAMA) Opthalmology.

Those enrolled in the study — all in their mid-70s with no outward symptoms of Alzheimer’s — underwent PET scans or sampling of spinal fluid.

About half came back with elevated levels of the Alzheimer’s proteins amyloid or tau, suggesting they would eventually develop dementia.

In this group, researchers also found thinning in the retina, something that experts had previously seen in autopsies of people who died from Alzheimer’s disease.

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“In the patients with elevated levels of amyloid or tau, we detected significant thinning in the center of the retina,” said co-principal investigator Rajendra Apte, professor of ophthalmology and visual sciences at Washington University in St. Louis.

“All of us have a small area devoid of blood vessels in the center of our retinas that is responsible for our most precise vision. We found that this zone lacking blood vessels was significantly enlarged in people with preclinical Alzheimer’s disease.”

Experts say brain damage from Alzheimer’s disease can begin up to two decades before signs of memory loss appear.

Close to 50 million people are living with dementia around the globe, and the toll is expected to mount in the coming decades as the population ages.

Alzheimer’s is the most common form of dementia, and there is no cure. But earlier detection may make it possible for drug or lifestyle interventions that may stave off the disease.

Currently, doctors use PET scans and lumbar punctures to help diagnose Alzheimer’s — both expensive and invasive techniques.

The type of technology used in the JAMA study is called optical coherence tomography angiography (OCT-A).

It is commonly used to shine light into the eye so that a doctor can measure the thickness of the retina and optic nerve.

Researchers say the retina and central nervous system are interconnected, so changes in the brain can be reflected in the cells of the retina.

“This technique has great potential to become a screening tool that helps decide who should undergo more expensive and invasive testing for Alzheimer’s disease prior to the appearance of clinical symptoms,” said the study’s first author Bliss E. O’Bryhim, a resident physician in the Department of Ophthalmology and Visual Sciences.

More work is needed to confirm that the technique works in larger populations, but researchers are hopeful that it could one day help screen people in their 40s and 50s. – Reuters

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