Brain scans can find evidence of Alzheimer's a decade or more before it causes memory and thinking problems, but they're too expensive and impractical for routine use. A simple eye test and warning signs like falls could be a big help. The eye study involved photographing blood vessels in the retina, the nerve layer lining the back of the eyes. Most eye doctors have the cameras used for this, but it takes a special computer program to measure blood vessels for the experimental test doctors are using in the Alzheimer's research, said the study's leader, Shaun Frost of Australia's national science agency, CSIRO.
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