Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 102)

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NOTE
To make it easier to align the goggles, eyecups and
eyepiece lenses to the eyes, depress the eye relief
adjustment (Figure 2-13) and slide the headmount socket all
the way forward before attaching the goggles.
(3) Align the goggles’ latch (Figure 2-1) to the headmount
socket (Figure 2-13). Press and hold down the latch lever while
installing the goggles into the headmount socket (Figure 2-13).
Release the latch (Figure 2-1) when the goggles fully engage the
socket.
(4) Set your eye relief by depressing the eye relief
adjustment (Figure 2-13) and move the goggles back toward your
eyes until the eyecups comfortably seal around the eyes.
(5) Turn the power switch to ON.
(6) 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.
(7) Readjust the vertical adjustment (Figure 2-13) of the
headmount until the goggles are properly aligned with your eyes.