Close-focus monoculars are commonly used in the low vision industry but are not restricted to. Monocular function like a binocular but only thing is has only one side to look through and have the advantage of being smaller and lighter and packing the same power and magnification. Monocular can be also used for hunting, night expedition (night-vision range), bird-watching, astronomy or watching the action at sporting events or concerts just like any binoculars.