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Find what's happening See the latest conversations about any topic instantly. Never miss a Moment Catch up instantly on the best stories happening as they unfold. Two American soldiers pictured during the Iraq War seen through an image intensifierNight vision is the ability to see in low-light conditions. Whether by biological or technological means, night vision is made possible by a combination of two approaches: sufficient spectral range, and sufficient intensity range.
Humans have poor night vision compared to many animals, in part because the human eye lacks a tapetum lucidum. Human vision is confined to a small portion of the electromagnetic spectrum called visible light.
Enhanced spectral range allows the viewer to take advantage of non-visible sources of electromagnetic radiation such as near-infrared or ultraviolet radiation. These include having a larger eyeball, a larger lens, a larger optical aperture the pupils may expand to the physical limit of the eyelids , more rods than cones or rods exclusively in the retina, and a tapetum lucidum. Enhanced intensity range is achieved via technological means through the use of an image intensifier, gain multiplication CCD, or other very low-noise and high-sensitivity array of photodetectors.
Retinal undergoes an irreversible change in shape when it absorbs light; this change causes an alteration in the shape of the protein which surrounds the retinal, and that alteration then induces the physiological process which results in vision. The retinal must diffuse from the vision cell, out of the eye, and circulate via the blood to the liver where it is regenerated.
In bright light conditions, most of the retinal is not in the photoreceptors, but is outside of the eye. It takes about 45 minutes of dark for all of the photoreceptor proteins to be recharged with active retinal, but most of the night vision adaptation occurs within the first five minutes in the dark.
In dark conditions only the rod cells have enough sensitivity to respond and to trigger vision. Normalised absorption spectra of the three human photopsins and of human rhodopsin dashed. Rhodopsin in the human rods is insensitive to the longer red wavelengths, so traditionally many people use red light to help preserve night vision. Red light only slowly depletes the rhodopsin stores in the rods, and instead is viewed by the red sensitive cone cells.
Another theory posits that since stars typically emit light with shorter wavelengths, the light from stars will be in the blue-green color spectrum. Therefore, using red light to navigate would not desensitize the receptors used to detect star light. This is found in many nocturnal animals and some deep sea animals, and is the cause of eyeshine. Humans, and monkeys, lack a tapetum lucidum. Nocturnal mammals have rods with unique properties that make enhanced night vision possible. The nuclear pattern of their rods changes shortly after birth to become inverted.
In contrast to conventional rods, inverted rods have heterochromatin in the center of their nuclei and euchromatin and other transcription factors along the border. In addition, the outer layer of cells in the retina the outer nuclear layer in nocturnal mammals is thick due to the millions of rods present to process the lower light intensities. The anatomy of this layer in nocturnal mammals is such that the rod nuclei, from individual cells, are physically stacked such that light will pass through eight to ten nuclei before reaching the photoreceptor portion of the cells.
Rather than being scattered, the light is passed to each nucleus individually, by a strong lensing effect due to the nuclear inversion, passing out of the stack of nuclei, and into the stack of ten photorecepting outer segments. The net effect of this anatomical change is to multiply the light sensitivity of the retina by a factor of eight to ten with no loss of focus.
Image intensificationMain article: Image intensifierThis magnifies the amount of received photons from various natural sources such as starlight or moonlight. Examples of such technologies include night glasses and low light cameras. In the military context, Image Intensifiers are often called 'Low Light TV' since the video signal is often transmitted to a display within a control center.
These are usually integrated into a sensor containing both visible and IR detectors and the streams are used independently or in fused mode, depending on the mission at hand's requirements. While many believe the light is 'amplified,' it is not. When light strikes a charged photocathode plate, electrons are emitted through a vacuum tube that strike the microchannel plate that cause the image screen to illuminate with a picture in the same pattern as the light that strikes the photocathode, and is on a frequency that the human eye can see.
This is much like a CRT television, but instead of color guns the photocathode does the emitting. The image is said to become 'intensified' because the output visible light is brighter than the incoming light, and this effect directly relates to the difference in passive and active night vision goggles. Currently, the most popular image intensifier is the drop-in ANVIS module, though many other models and sizes are available at the market.