Before revision: Measuring pupillary distance Pupillary distance measurement with iPad app Binocular PD measurements are done from pupil to pupil while monocular PD measurements are from either right or left pupil to center of the nose bridge.
After revision: alt=|PD measurement using an app (PD+ by Zernike)Measuring pupillary distance Pupillary distance measurement with iPad app Binocular PD measurements are done from pupil to pupil while monocular PD measurements are from either right or left pupil to center of the nose bridge.