Most night-vision binoculars are used by security personnel. Astronomy stores are accustomed to dealing with the confused beginner though of course not everybody has the opportunity to visit a specialist store.
While cleaning your binoculars, you should take care to see that no cleaning mark or scratch is left on the surface of the lens. When hiking or orienteering, binoculars will be very useful, but it is important to note that optics are very fragile, and so plastic lenses over glass ones, and a rugged case are probably going to be more important than high power, or the ability to use them at night. For astronomy use you will need at least 40mm aperture and preferably larger.
A good rule of thumb is, unless you are a private investigator or international spy, avoid buying a pair of binoculars with a magnification/zoom greater then 10x's. Magnification over ten generally causes the binoculars to lose some image crispness. If the lens cloth is not a one-time use variety, it should be cleaned lightly and thoroughly before each use and should be kept in a clean and dust-free bag.
When I finally got my first pair of binoculars just a couple of weeks ago, it was like Christmas again. You want to look for lightweight, tough, comfortable ones with clarity.
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