Another set of technical detail which is imprinted on the binoculars, could be something like this: 367 ft. at 1000 yds. This is the field of view (FOV), the width of the view at the particular distance. In this case 367 feet at 1000 yards. Could be designated in meters or in degree. Field-of-view is determined by magnification and eyepiece lenses. It is not true that binoculars with small objective lenses like pocket binoculars will inevitably have a narrow FOV. This can be addressed by the way the optics inside the eyepieces have been designed. Example: The Swarovski Optiks Pocket Binoculars 8×20 are very small pocket binoculars (dimensions: 3.98 x 1.5 x 2.3 inches) and have an aperture of only 20 mm and power of 8, but an excellent FOV of 345 feet @ 1,000 yards. Compare this to the FOV of 330 feet of the full-size NIKON 7294 Monarch ATB 8×42 Binocular, with 8×42 specifications.
FOV can also be expressed as degrees, e.g. 5.6 degrees, or 6.7 degrees.
Finally: FOV is handy, but not crucial, except in the case of young children, who still struggle to find and follow moving objects with a binocular.