Dr. Yangzhi Zhu of the Terasaki Institute for Biomedical Innovation (TIBI), with collaborators at UC San Diego and USC, published a Nature Sensors perspective on what it will take to turn tear-based wearable sensors into reliable, long-term health-tracking tools.
https://www.news-medical.net/news/20261008/New-framework-aims-to-improve-reliability-of-tear-based-health-sensors.aspx