Wearable health sensors for all skin tones

A December 10, 2025 SPIE (-International Society for Optics and Photonics) press release (also on EurekAlert) announces a new technique for monitoring health in both medical and consumer applications, Note: A link has been removed, Photoplethysmography (PPG) is an optical sensing technique that measures blood volume changes and underpins devices ranging from hospital-grade pulse oximeters [ ]