Researchers Developed Smart Lens to Measure Serotonin
A new contact lens prototype could one day help monitor stress markers in tears.
Updated on Oct. 13, 2026 in Mental Health
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On September 16, 2026, researchers at the Terasaki Institute for Biomedical Innovation revealed a smart contact lens designed to detect serotonin levels in human tears. This preliminary development aims to provide a non-invasive method for monitoring physiological signals associated with chronic stress.
Why it matters
Traditional stress monitoring often requires blood draws or other invasive procedures, which can skew results. Developing a wearable sensor to track biomarkers over time may offer a more practical approach to managing health and physiological responses to stress.
In a study described in Science Translational Medicine on September 16, 2026, researchers tested a ferrocene-based sensor on a pig eye model and 10 human volunteers. The device demonstrated the ability to detect serotonin concentrations as low as 72 picomolar and remained accurate through 400 uses.
The players
Terasaki Institute for Biomedical Innovation
A Los Angeles-based research organization focused on the development of smart biosensors and medical technologies.
National Institutes of Health
A federal agency that supports biomedical research and has provided a $6.9 million grant for ongoing work on multimodal lens platforms.
The details
The device features a hydrogel contact lens integrated with a stretchable sensor that identifies serotonin through electrical signals. When serotonin is present in the tear film, the sensor undergoes a chemical reaction that creates a detectable electrical current. This technology builds upon previous 2020 research that utilized a graphene sensor to monitor cortisol, a hormone closely linked to the body's physiological response to stress.
Timeline
1994: Researchers first identified serotonin in human tears.
2015: The University of Miami conducted a study on tear serotonin in 62 patients.
2020: A team led by Park published findings on a cortisol-measuring contact lens.
September 16, 2026: Terasaki Institute researchers described the new serotonin lens in Science Translational Medicine.
Health Landscape
This development follows the research path established by the Terasaki Institute for Biomedical Innovation's multimodal lens platform project by moving closer to continuous physiological tracking. It represents an evolution in medical sensing, aiming to shift from snapshot blood tests to wearable, non-invasive health monitoring.
This technology is currently in a research phase and is not available for clinical use or at-home monitoring. If you are interested in tracking stress-related biomarkers, discuss appropriate and validated diagnostic options with your primary care physician.
The takeaway
This preliminary research highlights the potential for non-invasive sensors to eventually monitor stress-related biomarkers through tear analysis. Keep tracking established indicators of stress such as sleep quality, mood changes, and physical symptoms to discuss with your doctor during routine checkups.
Further reading
For broader trends in emotional wellbeing and monitoring technology, visit our Mental Health section.
Source note: This article includes information reported by Research & Development World.
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