This device was invented to help sailors and army men to view and explore the distant objects. Sailors used this instrument to locate things like sea shore, storms or the pirates in the sea and in advance take evasive actions to prevent or to minimize the damage that may occur due to any untoward incident. While army men used to employ this device to monitor the movements of the enemy forces.

Even centuries later, though binoculars have undergone a radical change but their use is still same. But as told earlier now this device has been casted into several other types like the waterproof binoculars and the nightvision binoculars. Now there is a particular device for particular purpose. But before going further, one should know what are its kinds and their use.

Waterproof binoculars are the devices which are specially designed to meet the requirements of user's who work under water as it is not possible to take a normal magnifying device under water and then carry on the work, since chances are there that the particular magnifying instrument may stop working. Hence the waterproof binoculars are used specially by those people who work under water like scuba divers. This device work smoothly under water as it's lenses does not get wet and presents the user with clear vision under water. These type of instruments provides a great deal of help to researchers and tourists who want to explore the world under water bodies like sea or ocean. Not only can it serve the purpose under water but also at the time when the user wants to enjoy the beauty of nature in the season of rain, when it becomes difficult to carry the binoculars.

Like these type of binoculars, there is another type of binoculars called as night vision binoculars. These type of binoculars are mainly used for military purposes as this device help the soldiers to track the movement of the enemy soldiers. These binoculars work on the basis of infra red emission from human body concept.

Our human body emits the infra red energy all day but it so happens that in night when the normal human visibility falls considerably these type of binoculars help the user to see the other human movement quite comfortably. But these binoculars do encounter a peculiar problem too as it is not only human body that emits infra red energy but also the other objects like plants, animals. Therefore it becomes sometimes very difficult to view the desired object. These binoculars are not necessarily meant for military purposes but it is also of great use for those people who often go on safaris or camping.

Hence it is completely at the discretion of consumer to choose which type of binoculars he wants, if he want to go for waterproof binoculars then before purchasing he must make sure that the lenses used in the binocular are of high quality and also their body metal and not only in case of water proof binoculars and the same thing also goes for night vision binoculars too.

Key words: Waterproof Binoculars  ， Binoculars

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