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neurons

  • When you look at something, your retina gets a focused, upside-down image projected by the lens of your eye. (Petr, Novak, Wikimedia Commons)
    Eyes and Alzheimer's
    Walker Rhea
    Researchers think that looking at how quickly a person's pupil dilates when taking cognitive tests could predict if a person is at an increased risk for Alzheimer's disease, even before any obvious symptoms show up.