1.NounVision that works, to one degree or another, in the low-light conditions of night.
Such vision provided naturally by the biological systems of an eye.
"The field workers doing the nighttime field work had a rule that artificial lights were to be kept doused or shaded so as not to blind their night vision after their eyes had spent many minutes adjusting to the dark.; night vision goggles; The special forces operating in the area were relying heavily on night vision and smart weapon systems."
2.NounSuch vision provided naturally by the biological systems of an eye.
"The field workers doing the nighttime field work had a rule that artificial lights were to be kept doused or shaded so as not to blind their night vision after their eyes had spent many minutes adjusting to the dark."
3.NounSuch vision provided by technology or (in fiction) by superpowers.
"night vision goggles; The special forces operating in the area were relying heavily on night vision and smart weapon systems."