Binoculars with ergonomic eyecups

Ergonomic eyecups

— the angled eyecups ensure that the eyepiece(s) fit as closely as possible to the eye, providing a high degree of isolation from extraneous light sources that can impair image visibility and distract the user. On the other hand, such equipment is unsuitable for use with glasses (although in some models this disadvantage is compensated by the ability to turn up the eyecups).