|The following is based on Fallout 3 cut content and has not been confirmed by canon sources.|
They are identical in appearance to the biker goggles. They provide a damage resistance of 1 as well as a scripted night vision effect. The Peeper were most likely cut due to the night vision effect not working as intended, combined with time constraints.
They are located in the "TestPhil" cell along with many other cut items.