interpupilary
Interpupillary refers to the distance between the centers of the pupils of the eyes. This measurement, often abbreviated as PD, is crucial in various optical applications. When fitting eyeglasses, understanding a person's interpupillary distance ensures that the optical centers of the lenses are aligned with the pupils. This alignment is necessary for clear vision and to prevent eye strain or double vision.
The interpupillary distance varies among individuals and can change slightly throughout a person's life. It is
In addition to eyeglass fitting, interpupillary distance is also a consideration in the design of optical instruments