Manufacturers minimize this effect by applying special coatings on the glass surfaces. Besides increasing light transmission, coatings boost contrast and reduce the chances of seeing irritating ghost reflections of bright objects, especially at night. Nowadays, all binoculars have anti-reflection coatings on at least some glass surfaces. You can see this for yourself by looking at reflections in a binocular's front lenses. They offer the greatest transmission of light, but are also more expensive.
Eyepieces are also important to a good set of binoculars.
Their optical design determines eye relief and field of view. Eye relief is a measure of how far from the eyepiece an observer's eyes must be to see the whole field of view. Short eye relief makes using a pair of binoculars difficult for most eyeglass wearers. Most manufacturers supply an eye relief measurement in the binocular's technical specifications. You can also measure it by aiming the binoculars at a bright source of light and projecting the exit pupil onto a card.