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Surface Searching
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Lookout Training Handbook - Military training manual for keeping a lookout
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Dark Adaptation -Continued
scan for 5 seconds in as many small steps as possible across the field seen through the binoculars. Search the entire sector in 5° steps, pausing between steps for approximately 5 seconds to scan the field of view. At the end of your sector, lower the glasses and rest the eyes for a few seconds, then search back across the sector with the naked eye. When you sight a contact, keep it in the binoculars’ field of vision, moving your eyes from it only long enough to determine the relative bearing. SKY  SEARCHING Sky lookouts scan from the horizon to the zenith, aided only by sunglasses for protection from glare. Binoculars should only be used when needed to identify a contact that has been sighted with the naked eye. Scanning  of  the  assigned  sector  should  be accomplished by moving the eyes in quick steps (about 5°) across the sector just above the horizon. Shift the eyes  upward  about  10°  and  move  them  back  in  quick steps, continuing this type of search from horizon to zenith. (See figure 6.) When the zenith is reached, rest your eyes by blinking them for a few seconds, then start over. DARK   ADAPTATION If you were to go on night watch directly from a lighted compartment, you would be almost blind for a  few  minutes.  This  reaction  is  similar  to  that  you experience when you walk from a lighted theater lobby into   a   darkened   theater.   As   your   eyes   become accustomed to the weak light, your vision gradually improves. After 10 minutes you can see fairly well. After 30 minutes you reach your best night vision. This 12

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