Night vision devices are meant for visualizing objects in scantily lit areas. However there is a limit to the distance that one can view. One cannot expect a night vision device to work like a binocular. They are meant to facilitate visualization in poorly lit areas and not specific distances. They do not enhance the size of an object, they just allow visibility. What you can see through a night vision device depends on many factors. Some of the factors that affect visibility are as follows.
Viewed object
Larger objects are observed easily even from a larger distance as against smaller objects. The larger the object so is the distance large. Smaller objects can be viewed at lesser distance.
Details of object
For getting into the details of an objects one would need to view closely using a night vision device. For detecting objects or animals in the dark, a distant look with night vision device can be feasible. This is termed as detecting range.
Available light
Night vision devices allow visualizing objects that emit some amount of light. It detects infrared lights coming from the object and enhances it many fold to make the object visible. It also uses natural sources of light such as moonlight or star light. In conditions of ample light visibility is enhanced even from long distances. When light is scanty a near observation becomes necessary. So in a moonlit night or starlit night objects can be viewed from a larger distance as compared to on a cloudy night which makes visibility difficult from a longer distance.
Night vision goggles, fighting helmets, night vision monocular, night vision binocular are some of the devices used to see in near dark places.
Though night vision devices were invented to see in the dark, technology has advanced to a stage where night vision binoculars are invented to see objects from distance with much better quality and in detail. Night vision binoculars come in various models that allow users to see from larger distances that is not feasible through normal night vision devices like a night vision goggle. However it is important to remember that night vision equipments are meant to see in dark areas and not distance unlike binoculars. A combination of night vision device with binocular allows visibility from a distance only in the presence of some infrared light. In complete absence of light it will not be possible to view even with night vision binoculars.
