Note For Eyeglass Wearers; Adjusting For Interpupillary Distance - Vortex Viper User Manual

The lightweight yet durable Vipers feature an internal focusing
mechanism, O-rings at all open points, and are nitrogen-purged to
render them waterproof, dustproof and internally fogproof.

Note for Eyeglass Wearers

The Viper binoculars feature long eye relief and multi-step retractable
eyecups for comfortable viewing whether you wear eyeglasses or not,
and to reduce the bothersome effects of lateral light.
· If you plan on wearing eyeglasses/sunglasses, make sure the
retractable eyecups remain twisted in towards the binocular body
(see A below). If the eyecups are twisted out, the view through the
binoculars will appear as though you are looking through a tunnel.
· If you do NOT wear eyeglasses or sunglasses, twist up the retractable eye-
cups in order to see the full field of view (see B below). If you do NOT
have the eyecups positioned correctly, you will note black "crescents" in
your field of view.

Adjusting for interpupillary distance

In order to see one singular image, you must
adjust the two barrels of the binoculars to your
interpupillary distance (the distance from left
pupil to right). To do this, turn the barrels of the
binoculars on their central hinge until you see one
singular field of view with no disturbing shadows.
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