Originally Posted by
Sandcut
If you are using the binocs while wearing your glasses, you should fold down the rubber eye cups onto the oculars. This reduces the focal length (eye relief) and widens what is known as the "exit pupil", which will give you a wider field of view.
If you remove your glasses it works even better, but some folks prefer to keep their glasses on while using the binoculars. Switching from glasses to no glasses, depending on what you are looking for, is a PITA and typically results in sliding your glasses onto the top of your head where they end up falling on the ground and getting scratched. At least, that's my experience.