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Dark Adaptation -Continued
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Lookout Training Handbook - Military training manual for keeping a lookout
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complete adaptation for a night watch, spend 5 minutes on deck before relieving the watch. These 5 minutes allow the eyes to adjust to the amount of illumination in which they will work. NIGHT   LOOKOUT   TECHNIQUES Dark adaptation alone is not sufficient to ensure the highest visual keenness in the dark. Learning to use the eyes at night is like learning to use a precision instrument; you must practice to acquire the needed ability.  In  night  lookout  work,  don't  sweep  the  sky  or horizon with the eyes. The eyes do not see well when they  are  moving.  Scan  the  horizon  in  a  series  of movements  which  will  allow  your  eyes  to  come  to periodic rests as they scan the sector. When you are using night eyes, always look a little to one side and out of the corners of your eyes. Pay attention to the things on the outer edges of your field of vision. A faint object may not be recognizable until your gaze has been directed toward it a number of times. Likewise, direct your eyes slightly above or below the horizon, as there are times when you cannot see the actual horizon unless your line of vision is purposely elevated or depressed. One of the greatest aids to night vision is contrast between  object  and  background.  Therefore,  a  good technique is to concentrate on the point where the sky appears  to  meet  the  water.  Here  objects  may  loom above the darker water and be seen against the lighter sky. To summarize dark adaptation and night lookout techniques, remember these things: 1. Protect your eyes from light before going on night duty and while you are out. 2. Don't look directly at any light or illuminated object. 14

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