Eye Relief If you wear glasses when you use binoculars, this number is important. If you don t, it isn t. Eye relief is the distance (in millimeters) behind the exit pupil lens (the one you look through) where you can still see the full field of view of the binoculars. Wearing glasses artificially increases the distance between this lens and the pupil of your eye to a point where it s beyond the optimal distance the binocular was designed for. So, a eye relief is better 12 millimeters or more. Every binocular is different, so ask for this number when looking at each model.
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