Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an … See more

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. Measurements are typically reported in millimeters. … See more

Devices such as stereo microscopes have small exit pupils, and adjustment for user IPD is necessary. These devices can be designed to fit a large range of IPDs as factors such as size and weight of the adjusting m… See more