Measuring pupillary light reflex Georgina Lynch lab (IMAGE) Washington State University Caption A staff member in Georgina Lynch’s lab at the Washington State University Spokane campus demonstrates the use of a handheld monocular pupillometer to measure the pupillary light reflex. Credit Photo by Cori Kogan, Washington State University Usage Restrictions Credit photo 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.