If you have a
small face and your eyes are set close together, you may sometimes find it hard to find a
binocular that folds close enough for your eyes. This distance between the eyes is called your interpupillary distance or IPD for short. The bad news is that most binocular manufacturers don't actually specify of range of IPDs for their
binoculars. This can make it tough to buy the right binocular, sight unseen. The good news is that small, compact binoculars that use a double folding hinge body design, such as the excellent
Nikon Premier LX 8x20, will fold close for even the smallest face. If you must by sight unseen, this is the best
binocular body design when you have an unusually narrow IPD.