This item isn't available for export, neither directly or indirectly and may have specific export restrictions from the Federal Government. If you're outside the U. 5 Schott 4 Micron Fiber Optic Image Inverter Military NVG Night Vision Goggle. This is a lot of 5 Schott 4 Micron Fiber Optic Image Inverter Military NVG Night Vision Goggle. H: 20.10 MM W: 18.10MM. These came from a local DoD contractor working on NVG for the US Military. SCHOTT has pioneered night vision technology for several decades now. Our fiber optic inverter, or twister technology, is a key part of night vision ...