blurry or lose detail. At night, the opposite is true. Focusing directly on an object after dark results in that object being visible for only a few seconds. After that, the object becomes almost invisible. To view an object at night, the soldier must shift his gaze slightly to one side. This allows the light-sensitive parts of the eye (parts not used during daylight) to be used. These can detect faint light sources or reflections and relay their image to the brain. (Figures 5-1 and 5-2.)

NOTE: Vision is shifted slightly to one side, but attention is still on the object. Because of the blind spot at the center of vision, directing attention to an off-centered objective is possible (with practice).

Figure 5-1. Daytime field of view using pinpoint focus.

M16a2 Parts Names
Figure 5-2. Nighttime field of view using off-center vision
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