Amber filters are designed to reduce eye splash when wearing NVGs. While we generally prefer to use the rubber eye cups that are included with most NVGs, in certain situations (i.e. extended close-quarters use in a humid environment) these filters are a must-have.
The Wilcox Filter Cover Assembly for the AN/PVS-14/15/18 and F5050 features an amber lens that quickly attached and detaches to the eyepiece lens of a variety of Night Vision Goggles and Scopes. The unique padded rubber eye cup protects the eye socket from impact injury and the amber filter provides tactical advantage by greatly reducing green eye splash common to all NVG devices. They're made from wavelength controlled polycarbonate (Lexan) and rubber.