The quick version of this Alzheimers test is that it’s research.
But given that individuals with Down’s Disease (virtually all) get Alzheimers then looking at their characteristics may help researchers with new treatments.
Turns out the amyloid protein associated with Alzheimers is also found in the eyes of Down’s disease patients.
It is therefore possible according to lead researcher Dr. Lee Goldstein of Boston University School of Medicine that a test could be devised to measure the level of protein in eyes and correlate it to the existence of the protein in the brain. (note that now, the only test is post-mortem dissection/evaluation).