Scanning is the use of off-center vision to observe an area or object and involves moving the eyes in a series of separate movements across the objective area.
A common method of scanning is to move the eyes in a figure eight pattern (see fig. 10-11). A Marine moves the eyes in short, abrupt, irregular movements over and around the area. Once a target indicator is detected, focus is concentrated in that area, but not directly at it. Pause a few seconds at each point of observation
since the eyes cannot focus on a still object while in motion. Rest the eyes frequently when scanning.
While you are observing, there may be periodic blackouts of night vision due to simple fatigue. This is normal and is not a cause for alarm. Night vision will quickly return after the eyes are moved and blinked a few times.
It is more effective to scan from a prone position or a position closer to the ground than the object being observed. This creates a silhouetted view of the object.
When scanning an area, look and listen for the same target indicators as in daylight: movement, sound, and improper camouflage.
Objects in bright moonlight/starlight cast shadows just as in sunlight.
Sound seems louder at night than during daylight.
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