text: Appendix J
  Figure J-1. Typical scanning patterns.
  OFF-CENTER VISION
  J-4. Looking straight at an object (using central vision) works in daylight, but not at night. This is due
  to the aforementioned central blind spot. To compensate for this blind spot, Soldiers use off-center
  (peripheral) vision. In other words, instead of looking directly at an object, they look 10 degrees above,
  below, or to either side of it (Figure J-2).
  Figure J-2. Off-center viewing technique.