Wearable optical device (IMAGE) Optica Caption Researchers developed a wearable wrist-worn device that uses laser speckle imaging to catch early signs of postpartum hemorrhage. Credit Francesca Bonetta-Misteli, Washington University in St. Louis Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.