Editing Night vision (section)

===Current technology===
[[Image:Nachtsichtgeraet.jpg|thumb|right|Binocular night vision goggles on a flight helmet. The green color of the objective lenses is the reflection of the light interference filters, not a glow.]]
{{uncited section|date=December 2017}}<!--seems to have been uncited since 2012-->

A night vision device (NVD) is a device comprising an image intensifier tube in a rigid casing, commonly used by [[military forces]]. Lately, night vision technology has become more widely available for civilian use.  For example, [[enhanced vision system]]s (EVS) have become available for aircraft, to augment the situational awareness of pilots to prevent accidents.  These systems are included in the latest avionics packages from manufacturers such as [[Cirrus Aircraft|Cirrus]] and [[Cessna]]. The US Navy has begun procurement of a variant integrated into a helmet-mounted display, produced by Elbit Systems.

A specific type of NVD, the night vision goggle (NVG) is a night vision device with dual eyepieces.  The device can utilize either one intensifier tube with the same image sent to both eyes, or a separate image intensifier tube for each eye. Night vision goggles combined with magnification lenses constitutes night vision binoculars. Other types include monocular night vision devices with only one eyepiece which may be mounted to firearms as night sights. NVG and EVS technologies are becoming more popular with helicopter operations, to improve safety. The [[National Transportation Safety Board|NTSB]] is considering EVS as recommended equipment for safety features.

Night glasses are single or [[binocular vision|binocular]] with a large diameter objective. Large lenses can gather and concentrate light, thus intensifying light with purely optical means and enabling the user to see better in the dark than with the naked eye alone. Often night glasses also have a fairly large [[exit pupil]] of 7&nbsp;mm or more to let all gathered light into the user's eye. However, many people cannot take advantage of this because of the limited dilation of the human [[pupil]]. To overcome this, soldiers were sometimes issued [[atropine]] eye drops to dilate pupils.{{when|date=May 2012}}

Currently, the PVS-14 monocular is the most widely used and preferred night vision device across NATO forces. It is used by the United States army, and is known for its low cost and wide range of uses and modification ability. Some higher end devices including the PVS-31 binocular and GPNVG-18 quad-tube night vision are used by special forces groups, but are costly. Monoculars are generally preferred by developed forces.

Night vision systems can also be installed in vehicles. An [[automotive night vision]] system is used to improve a vehicle driver's perception and seeing distance in darkness or poor weather.  Such systems typically use infrared cameras, sometimes combined with active illumination techniques, to collect information that is then displayed to the driver. Such systems are currently offered as optional equipment on certain premium vehicles.