Forget the soul, it turns out the eyes may be the best window to the brain. Changes to the retina may foreshadow Alzheimer’s and Parkinson’s diseases, and researchers say a picture of your eye could assess your future risk of neurodegenerative disease.

Pinched off from the brain during embryonic development, the retina contains layers of neurons that seem to experience neurodegenerative disease along with their cousins inside the skull. The key difference is that these retinal neurons, right against the jellylike vitreous of the eyeball, live and die where scientists can see them.

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Catching the warning signs of neurodegenerative disease earlier could give patients more time to plan for the future – whether that’s making caregiving arrangements, spending more time with family or writing the Great American novel.

In the longer term, researchers hope the ability to notice brain changes before symptoms begin could eventually lead to early treatments more successful at slowing or stopping the progress of Parkinson’s and Alzheimer’s, since no such treatment is currently available. The hope is that “the sooner we intervene, the better we will be” at preventing cognitive impairment, Petersen said

While scientists developing blood tests for Alzheimer’s and Parkinson’s continue to receive the lion’s share of the research funding, retinal screening could be noninvasive, inexpensive and remarkably sensitive, proponents say.

Read more at IOL.