Leupold FX-3 Owner's Manual page 12

If your Leupold scope is one of our models with an eyepiece that has
a lock ring, follow these simple steps:
1 . grasp the eyepiece with your hand and back it away from the
lock ring . once the lock ring is free from the eyepiece, turn it
clockwise away from the eyepiece to keep it out of the way
during the adjustment .
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2 . If you tend to hold things away from yourself to see them
clearly (you are farsighted) turn the eyepiece counterclockwise
a couple of turns . If you hold things close to yourself to see
them clearly (you are nearsighted) turn the eyepiece clockwise
a couple of turns .
3 . Looking through the scope when pointed at the sky, take a
few quick glances at the reticle . The focus of the reticle should
be noticeably different from when you started . Continue this
process until the reticle appears clear and sharp .
4 . When you are satisfied with the image of the reticle, turn the
lock ring so that it rests firmly against the eyepiece .