Glaucoma is often asymmetric in nature, and an afferent pupillary defect (APD) is frequently present in persons with glaucoma. The investigators propose to conduct a clinic-based prospective study to assess the accuracy of using a binocular pupillographic device (RAPiD, Konan Medical, USA) to detect people with glaucoma. This device is designed to record and analyze pupil responses at multiple, controlled stimulus intensities, while using varied patterns and color stimuli.