Now One of my Customers asked me why don't they make a Sacrificial Window that fits under the lens cap?  My reply was I can do that. below is the new Wilcox Sacrificial Window for use on most night vision goggles and monoculars.

Wilcox Sacrificial Window installed on AN/PVS-14A

Wilcox Sacrificial Window installed on AN/PVS-14A with lens cap installed over it

Wilcox AN/PVS-14A Sacrificial Window available now for $25.00 each plus S&H.