Night vision monoculars and binoculars are devices that allow you to see in low light conditions by amplifying available ambient light. When the light enters the device through an objective lens, it is focused on a phosphor screen which transforms it into a green picture (the human eye is very sensitive to differences in shades of green).
In total darkness when not enough light is available, the infrared light illuminator can be used as it works like a torch and brightens the scene with IR light invisible to the naked eye but visible to the night vision device.
Night vision binoculars are great for long-term observation and give true depth of field, enabling the user to judge distances more accurately. a night vision monocular has a single lens assembly, instead of two. This design can create a flattened effect and distort perspective, which is something to be aware of when using a night vision monocular. Depending on the design, the device may only be used by one eye, or it may feed an image to both eyes.
