Lab on a Contact Lens Can Measure Stress Through Serotonin

Scientists have developed a contact lens with a built-in lab that can measure stress levels by detecting changes in serotonin levels in the tear fluid. The lens uses electrochemical sensors to measure the neurotransmitter, which is released in response to stress. The device has been tested in a small study with 12 participants, who wore the lens for 2 hours while performing tasks that were designed to induce stress. The results showed that the lens was able to accurately detect changes in serotonin levels, with a correlation coefficient of 0.82. The researchers believe that this technology could be used to develop non-invasive and continuous monitoring of stress levels, which could be useful for people with anxiety disorders or other conditions that involve stress. The study was published in the journal Nature Communications.