Are there military specifications to limit optical distortions?
A There are very rigid Military Specifications for in-air vision systems, but flat masks distort 10 times worse than these requirements! Magnification — objects look 25% closer and 34% bigger than reality. Bifringence — when you look where your nose points, things are sharp. But the further off-axis you look, the fuzzier the view becomes. Pincushion Distortion — off axis lines bow inward; all shapes are distorted, worst at the edges. The next time you’re in a swimming pool, observe the tiles through a flat mask both on & off axis. The MEGA vastly exceeds MilSpecs for optical resolution. (top) 5.