But doctors say it may be a while before there’s an official test.
But why? “The retina is considered an extension of the brain,” says study co-author Maya Koronyo-Hamaoui, Ph.D., a professor of neurosurgery and biomedical sciences at Cedars-Sinai. “It is the only central nervous system organ not encapsulated by bone. Hence, it is easily accessible for visualization directly, non-invasively, and affordably, with high spatial resolution and sensitivity.”
The brain and eye have nerves running between them, explains Amit Sachdev, M.D., M.S., medical director in the Department of Neurology at Michigan State University. “Nerves contain two parts: a body and an axon,” he says. “The body contains all-important parts to regulate the nerves maintenance and growth [and] the axon is like a very long tail.”
Axon are long and, if it’s damaged anywhere, it will begin to degenerate “often from the tip back towards the body,” Dr. Sachdev says. “When you look at the eyes, you are looking at the tips of nerves,” he continues. “The nerve runs all the way to the back of the brain. As you can imagine, brain disease might easily interfere with the health of these very long projections.” or retina, says David J. Calkins, Ph.D., vice-chairman and director for research at The Vanderbilt Eye Institute.
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