visual field
field of vision
field of regard

Perhaps a score of machines were in her visual field.

The visual field of the athlete is less than 5 degrees.

The left visual field is favored by the right brain.

To check for vision loss in any area of your visual field.

Her words appeared as white strokes upon a blue visual field.

Sometimes it simply is not possible to keep all the relevant players in the visual field at once.

They often appear at the edges of your visual field.

At least, in those years, with a clear visual field of two arms' length, I could move about without falling over things.

The hall's far end is described as the central axis of the building's main visual field.

For example, the visual field of a bird does not extend behind its body.