Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 106)

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(1) Ensure that batteries are installed per paragraph 2-6.
(2) Don the helmet mount per paragraph 2-16 (original
style), 2-17 (new style with quick disconnect), 2-18 (new quick
disconnect with new nape strap) or 2-19 (AN/PVS-7D version).
(3) Place the goggles in the socket of the helmet mount.
Set your eye relief by depressing the side buttons (or press down
on side lever on metal mount) (see Figure 2-28) and carefully
move the goggles fore or aft until the eyecups comfortably seal
around the eyes. Readjust the helmet straps as required for
vertical adjustment.
(4) Turn power switch to ON. Adjust the tilt by using the tilt
adjustment lock knob (or tilt adjustment lever on metal mount)
(Figure 2-28) until you obtain a comfortable viewing angle.
(5) Adjust the interpupillary distance (Figure 2-1) by sliding
the eyepiece lenses together or apart so each eye can observe the
entire field-of-view at the same time. The eyepiece lenses adjust
independently. If necessary, readjust the eye relief.
Figure 2-28. Tilt and Flip-up Mechanisms.