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The original was posted on /r/science by /u/mvea on 2024-05-05 23:02:32.

Original Title: A new study shows that loss of visual sensitivity can predict dementia 12 years before it is diagnosed. For the test, people had to press a button as soon as they saw a triangle forming in a field of moving dots. People who would develop dementia were much slower to see this triangle on the screen.