Field of vision. what does it mean?

Peripheral vision: When someone refers to "field of vision" they are usually referring to your visual field, or the entire scope of what you see in your vision, most notably your peripheral vision. This phrase is also often used to refer to a visual field test which tests your extent to see in your peripheral vision. This is a test routinely used in the evaluation and treatment of glaucoma.

How far you see: The field of vision is the entire area, from left to right, up to down, and in a roughly circular area, that a person can see when looking straight ahead. Certain diseases, such as glaucoma, can rob us of our peripheral field of vision. Others, such as macular degeneration, can cause us to lose our central vision while retaining our peripheral vision.

See below: Your visual fild is the zone that you are capable of seeing with out moving your eyes (horiz and vert).