Nikon 4x10DCF Manuel D'utilisation page 23

2) While looking through the binoculars, move them closer to or away from
your eyes until there is no shadow in the viewed image.
For eyeglass wearers, pressing your glasses against the rubber eyecup
makes it easier to find the correct distance.
3) Focusing the subject.
Rotate the focusing ring counterclockwise to see near subjects.
Rotate the focusing ring clockwise to see more distant subjects.
If the eyesight of your left and right eyes greatly differs, focus binoculars
with the most comfortable eye (usually the dominant eye).
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