But blue though is the best for seeing generally in the dark and then allowing your eyes to adapt back to the darkness the quickest. Problem is though the blue doesnt allow you to see much detail thats where you need to use a longwavelength red at low levels.
Red was a color used for that but and heres the kicker blue has been used as well and if I recall right the navy experimented with blue lights on the fleet boats in WWII and found it to be even better than red. They might be bulkier than they are in real life, but they'd likely have some from of existence. From a realistic standpoint, it's common sense that they were invented. Personally? I'd rather see a type of red-LED flashlight instead of traditional nightvision - because the light a red light gives off doesn't hurt our natural night vision and it still illuminates things. So it would have been invented in some form. It's invaluable to combat situations that take place in dark areas.
Night Vision is simply pure military strategy.
