 | | As with eyeglasses, binoculars must fit the width of the user's eyes to be effective. The natural accommodation was to design sturdy hinge systems that allow you to adjust for your particular Interpupillary Distance (ID), which is the center-to-center distance between your pupils.
When examining the overall width of binocular models, it is necessary to establish a base line ID as a standard position. All Zeiss binocular width measurements, therefore, are based on an ID of 65mm. | |  |