GPO USA 8x42 Passion ED Binocular (Black) - Manual (Page 11)

Eyecup adjustment
The rotary eyecup has two break positions for different applica-
tions. The different break positions allow you to custom adjust
the distance between your eye and the ocular lens. This beneficial
feature allows you to be able to adjust the eye distance to your
personal preferences. This adjustment creates additional benefits
for use with and without eye glasses.
Use without glasses:
Most frequently, users not wearing
eyeglasses will need to adjust the
rotary eyecup completely up. Twist
the eyecup counterclockwise until the
eyecup is fully extended. Users not
wearing eyeglasses may also find the
full field of view more comfortable
with the eyecup slightly rotated
down. For this purpose, there are
additional break positions for your
use and your personal preference.
Use with glasses:
Most frequently, users wearing eye-
glasses will need to adjust the rotary
eyecups completely down. Twist the
eyecups clockwise.
Adjustment of the interpupillary
distance (ipd)
Interpupillary distance (IPD) is the distance between the center of
the pupils of the two eyes. For a full “field of view”, the IPD of
the binocular must be adjusted to match the IPD of the user. This
can be accomplished by simply opening or closing (buckling) the
center hinge of both binocular halves while looking through the
binocular. The IPD adjustment is correct when you can see a clear
single circular picture with both eyes open.
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