Celestron 7x50 SkyMaster Pro ED Binoculars - Manual (Page 6)

6 I ENGLISH
As interpupillary distance, or the distance
between the pupils, varies from person to
person, the binocular must be correctly aligned
(adjusted) to the distance between your pupils
to achieve a single, clear image. To adjust this
distance, lift the binocular to your eyes (using
both hands) and look through them at a distant
object. Move the two barrels (halves) of the
binocular closer together or further apart until
you see a single, clear image. Check that the
interpupillary distance is set correctly every
time you use your binocular.
ADJUSTING THE INTERPUPILLARY DISTANCE
WARNING: Never look at the Sun with the naked eye or with
your binocular. Looking at the Sun can cause
permanent eye damage.