Hello
The current night vision is more like looking through a green tinted glass.
Night vision could be a bit more grainy, there could be more contrast between illuminated areas and dark areas and bright lights could shine brighter, interfering with visibility. Bright sources of light could make the dark areas even darker when looked at.
Real Night vision
http://www.youtube.com/watch?v=SuEM2SBvYw4
http://www.youtube.com/watch?v=n2YKdZv_osU
Night vision Arma 3
http://www.youtube.com/watch?v=i083ZCityu4
http://www.youtube.com/watch?v=sTJy_TLJpyo