"What we found was not subtle," co-author Paul Crane said in a statement. "This study solidifies that there are mechanistic things we can learn from the brain by looking at the eye."
While the analyst do not know why there is a relationship between the three eye illnesses and the memory loss disease, they wrote, "anything happening in the eye may relate to what's happening in the brain, an extension of the central nervous system."
A better understanding of neurodegeneration in the eye and the brain could help diagnose Alzheimer’s early, but they said the connections need to be investigated more.
“We don’t mean people with these eye conditions will get Alzheimer’s disease,” lead researcher Cecilia Lee added.
"The main message from this study is that ophthalmologists should be more aware of the risks of developing dementia for people with these eye conditions and primary care doctors seeing patients with these eye conditions might be more careful on checking on possible dementia or memory loss."