Bar-Ilan University graduate Aviv Mesika has developed the LacriScan diagnosis test which uses a patient’s tears to diagnose Alzheimer’s and Parkinson’s in their pre-symptom stages. The new test is more sensitive than previous ones and checks for multiple brain chemical markers of the two diseases.
https://nocamels.com/2023/07/tracking-your-tears-in-early-test-for-alzheimers-and-parkinsons/