17-430

field of vision

extent of space in which objects are visible to an eye in a given position

Equivalent term: "visual field"

NOTE 1 In the horizontal plane meridian the field of vision extends to nearly 190° with both eyes open, the area seen binocularly is about 120°, and the area seen by one eye only is about 154°.

NOTE 2 The extent of the field of vision tends to diminish with age.

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