EOTech M914 (AN/PVS-14) Monocular Night Vision Device - Manual (Page 34)

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2.5 LENS ACCESSORIES
Objective Lens Cover
The objective lens cover affords additional protection to the
objective lens and protects the MNVD’s internal imaging
components. It should be pressed into place (installed) over
the objective lens whenever the MNVD is not being used. It
should also be installed when the MNVD is being used in
brightly lit environments. A small hole in the center of the
lens cover allows enough light to enter the MNVD when
operating in these conditions. In darker environments, better
performance will be observed with the lens cover uninstalled.
The objective lens cover is held captive to the MNVD by the
neck cord.
Sacrificial Window
A sacrificial window is provided to protect the objective lens
from becoming scratched or otherwise damaged. The
sacrificial window should be pressed into place (installed)
over the objective lens whenever the lens cover is not
installed.
Demist Shield
CAUTION
The coating on the demist shield may be damaged
if cleaned while wet. Clean the demist shield only
when dry and using dry lens tissue.