ATN Viper Night Vision Goggle

Ideal for hunting, camping, boating, or surveillance, the ATN Viper expandable goggle system makes it easy to see in the dark while keeping your hands free for activities.
The first-generation, high-resolution night-vision unit features a magnification ratio of 1x, but offers the option of expanding to 4x or 8x. More significantly, the unit is extremely versatile: you can use it for hands-free activities such as fishing or paintball, as a compact monocular, or attach it to a camera for nighttime photography. And even though ATN outfitted the Viper with a heavy-coated glass lens, the company managed to keep the weight down to only 9 ounces.
The Viper fits around your head via a comfortable fabric strap, which includes both forehead and chin pads for security.
The goggle itself, meanwhile, offers such features as a built-in IR illuminator, an automatic brightness control, an adjustable eyepiece, a manual focus system, and single-switch button operation.
An excellent alternative to night-vision binoculars, the Viper is water-and dust-resistant and comes with a soft case.
Product Description
ATN Viper Compact Gen 1+ Night Vision Goggle with IR illuminator for Hands Free operations. 1x magnification with the option of 4x or 8x (additional lens and doubler required, not included). Unit is one of the smallest night vision devices ever produced and can be used as compact monocular or goggle (headgear included). Requires one 3V lithium battery, CR123A, included. ATN Corp manufactures and distributed the widest array of Night Vision and high quality optics in the world. We are a sales and market leader in the US. Unsurpassed customer service on both our website and 800#, our technicians are the most knowledgeable in the world. We manufacture for the US Military, law enforcement, the FBI and the US Department of Homeland Security,
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ATN Night Vision Goggles VDO from Youtube.com

Biological night vision

Biological night vision:

In biological night vision, molecules of rhodopsin in the rods of the eye undergo a change in shape as light is absorbed by them.
Rhodopsin is the chemical that allows night-vision, and is extremely sensitive to light.
Exposed to a spectrum of light, the pigment immediately bleaches, and it takes about 30 minutes to regenerate fully, but most
of the adaptation occurs within the first five or ten minutes in the dark. Rhodopsin in the human rods is less sensitive to the longer
red wavelengths of light, so many people use red light to help preserve night vision as it only slowly depletes the eye's rhodopsin
stores in the rods and instead is viewed by the cones.

Many animals have a tissue layer called the tapetum lucidum in the back of the eye that reflects light back through the retina, increasing
the amount of light available for it to capture. This is found in many nocturnal animals and some deep sea animals, and is the cause
of eyeshine. Humans 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 contemporary rods, inverted
rods have heterochromatin in the center of their nuclei and euchromatin and other transcription factors along the border.
In addition, the outer nuclear layer (ONL) in nocturnal mammals is thick due to the millions of rods present to process the lower light intensities
of a few photons. Rather than being scattered, the light is passed to each nucleus individually.[3] In fact, an animal's ability to see in low light
levels may be similar to what humans see when using first- or perhaps second-generation image intensifiers.
Large size of the eye, and large size of the pupil relative to the eye, also contribute to night vision

From: www.en.wikipedia.org/wiki/Night_vision

Youtube VDO about Night Vision

If you are looking for a night vision goggle that's effective, but relatively inexpensive to own, check out the ATN Viper.
It is designed primarily as a goggle system for hands-free operation, but it can also be used as a compact monocular or attached to a camera for night time photography. The Viper is a high-resolution 1st Gen.+ night vision unit that comes with a coated 35mm F1.0 glass lens capable of 1x magnification, and the option of being 4x or 8x.

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