Definition of field of vision noun from the Oxford Advanced Learner's Dictionary

 

field of vision

 noun
noun
BrE
 
; NAmE
 
(also field of view, or specialist visual field)(pl. fields of vision/view, visual fields)
 
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the total amount of space that you can see from a particular point without moving your head He saw Ann look away from him and leave his field of vision. With increased power, the field of vision of the binoculars becomes smaller.
See the Oxford Advanced American Dictionary entry: field of vision