Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 64)

2-29
NOTE
Make sure the shading is not the result of
improper eye-relief adjustment (refer to paragraph
2-22).
(2) Edge Glow. Edge glow is a bright area (sometimes
sparkling) in the outer portion of the viewing area (see Figure 2-4).
To check for edge glow, block out all light by cupping a hand over
the objective lens. If the image intensifier is displaying edge glow
the bright area will still show up. Return the NVG to the
maintainer.
Figure 2-4. Edge Glow.
(3) Flashing, Flickering, or Intermittent Operation. The
image may appear to flicker or flash. If there is more than one
flicker, check for loose battery cap or weak battery. If weak or
loose batteries are not the problem return the NVG to the
maintainer.