Unlike most animals, humans do not have the capability to see in low light conditions. The structure of the human eye is such that images can be seen only inside the limits of visible light and not beyond it. The capability to see in the dark or low light conditions is largely present in nocturnal animals, whereas other animals that are normally active during the daytime are also able to see at night. Humans and monkeys do not have this capability because their eyes lack a tissue behind the retina. This tissue reflects whatever light that is present back through the retina to capture the image.
Visibility in darkness
A lot of research has been done on enhancing the human vision at night. Devices with the capability to see at night were first used in the Second World War, and the technology has been evolving over the years. The latest devices used for seeing in low light conditions produce monochromatic images, i.e. the image is shown I with a single color that is usually green. These devices are mostly used by the armed forces as they have to keep vigil in darkness. Security forces also use Digital Night Vision under special conditions when they are operating at night. At present civilians can also procure these devices.
Device manufacturing companies
There are a large number of companies that have been conducting research on the device and have been successful to come out with their own designs. Some of these companies manufacture these devices under license of the government, especially for the armed forces and the security agencies. They have also entered the civilian market with various types of products. Some of the high-quality products are known as Pulsar Night Vision products.
Type of products
There are three main categories of products that can be used to see in low light conditions. These are monoculars, binoculars, and goggles. Monoculars are used to see with one eye while the binoculars and goggles are used to see with both eyes. Yukon Night Vision products, and include binoculars. There are other companies that manufacture normal goggles that look just like normal spectacles but have lenses that enhance the vision of drivers of cars and bikes. These goggles help when the ambient light is very low, or there is too much light for oncoming vehicles. These goggles can be used in bad weather conditions as well as they protect the eyes from dust and rain.