line of vision
Noun
Meaning
an imaginary straight line along which an observer looks
Source: WordNetSynonyms
Hypernyms
Examples
Hearing a loud shout I tore my eyes away from my Twitter feed to see a tall young man scamper across the taxi rank, a CD or a DVD gleaming in his hand, screaming “This is my movie!” at someone beyond my line of vision.
The digital instrument cluster shows the driver the area around the car – within the driver’s line of vision – with a red line around any sources of potential danger.