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The image that you get in
Night Vision will not be clear at first instance. It will appear in an indistinct green color. Finally, Ocular Lens gives adjustment that is fit for your particular eyesight. The Objective Lens of a Night Vision gives you choice of adjusting focus according to distance of object you are viewing.
There are different types of Night Vision glasses. Some of popular Night Vision glasses are Generation1, Advanced Night Vision, Night Vision Monocular, Night Vision Binocular and Audio Monocular. The Generation 1 doesn’t need an active infra red light source. Instead it amplifies existing light several thousand times to let you see in dark. It is currently most popular type of Night Vision in world. These units provide a bright and sharp image at a low cost, which is perfect, for all your adventures, exploration and voyages.
The other versions of Night Vision are used for specific purposes only. For instance, Monocular and Binocular with different lens powers are used for close range viewing and short range viewing. Night Visions of various types are put into use for fishing, boating, wild life observation and security purposes. Unlike Generation 1, other types of Night Visions are pretty expensive.
Author provides great information at http://www.anightvision.com - Night Vision resources.
