People brings the object close to their eye and to the very center of their visual field because visual acuity is highest in the region with the largest concentration of cones, which is the over at the very center of the eye.
The visual field refers to the total area in which objects can be seen in the side (peripheral) vision as you focus your eyes on a central point. This article describes the test that measures your visual field.
A normal visual field is an island of vision measuring 90 degrees temporally to central Fixation, 50 degrees superiorly and nasally, and 60 degrees inferior.
Learn more about visual field here,
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