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 TM 9-258
single image is formed when the image is focused on the
the eyes are placed in a condition. of forced equilibrium
macula of each eye where best vision is obtained. Under
by the expenditure of an amount of nervous and
ordinary conditions this is done when viewing a distant
muscular force resulting in rapid fatigue.
object. In using an instrument, images may be at
different points and
3-18
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