What is Interpupillary Distance and what is an IPD Scale?
Interpupillary distance is the distance between the human eyes or the distance between the oculars or eyepieces of a binocular. An IPD (interpupillary distance) scale is a small moving scale on the binocular usually near the center with a small notch that adjusts up and down the scale as you expand and contract the size of the binocular. An IPD scale can be useful when there are multiple people using the same binocular. It helps by helping a user remember what setting is most comfortable for them.
