Off-center vision is the technique of keeping the attention focused on an object without looking directly at it (see fig. 10-10). To search for targets using off-center vision, never look directly at the object you are observing. You will see the object much better by using off-center vision. Look slightly to the left, right, above or below the object. Experiment and practice to find the best off-center angle for you. For most people, it is about 6 to 10 degrees away from the object, or about a fist's width at arm's length.
Staring at a stationary object in the dark may make it appear to be moving. This occurs because the eye has nothing on which
to reference the exact position of the object. This illusion can be prevented by visually aligning the object against something else, such as a finger at arm's length.
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