EOTech M914 (AN/PVS-14) Monocular Night Vision Device - Manual (Page 35)

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2.4 LENS ACCESSORIES – Continued
The demist shield is provided to protect the eyepiece from
becoming scratched or otherwise damaged, and to prevent
fogging of the eyepiece. It should be installed whenever the
MNVD is in use. With the eyecup removed, place the demist
shield over the eyepiece with the narrow side in. Taking
care not to smudge the eyepiece or demist shield, press the
demist shield into place.
Eyecups
The MNVD is equipped with both a standard and shuttered
eyecup to accommodate a variety of tactical situations and
mounting configurations.
Figure 2-11 MNVD Eyecups
To install, press the desired eyecup over the end of the
eyepiece. If installing the standard eyecup, rotate to obtain
proper eye / cheek weld.
STANDARD EYECUP SHUTTERED EYECUP