| These days there are various kinds of refurbished | | | | belongs. |
| night vision goggles that are available in the market. | | | | Until now there has been 4 generations of goggles |
| These are basically used for security purposes as | | | | ranging from Gen 1 to Gen 4. This categorization has |
| they improve the visibility during the night. Most of the | | | | been done on the basis of their light intensifier tube. Out |
| night vision goggles work in two ways. The first is by | | | | of these, Gen 4 is the latest one and is the expensive |
| using enhancement of image and the second is by | | | | of them all. It employs precision optics for a more clear |
| employing thermal imaging. | | | | vision in the darkness. |
| The most advanced night vision goggles make use of | | | | It is the light intensifier tube in a refurbished night vision |
| both ways that ensures a better perception and clarity. | | | | goggles, which executes its main function. It enables |
| Any normal night vision goggle allows us to see | | | | the target to be viewed easily at night. These are very |
| anything in darkness at a distance of around 250 feet. | | | | lightweight, portable and easy to use. Some of the |
| Refurbished goggles are generally used by police or | | | | most advanced generation of refurbished night vision |
| the military for their missions. However, an individual | | | | goggles are light and small viper goggles. |
| can also purchase it for their personal use. The | | | | There are many others night vision goggles such as |
| commercial night vision goggles have different grades | | | | military issue AN PVS-7. Wildlife observations, hunting, |
| according to the requirements. There are various | | | | boating and for security is the main purposes for which |
| generations to which each of these night vision goggle | | | | these night goggles are used. |