The field which an individual is visually aware of, either using one eye (monocular field of view) or two eyes (binocular field of view). For each eye, the normal visual field extends from about 60 degrees nasally from the midline to 100 degrees temporally from the midline, and about 60 degrees above and 75 beneath the horizontal. Various methods exist to measure the extent and sensitivity of the visual field, and depend on the patient detecting either moving targets of different sizes, or a static targets of increasing intensity. The visual field can be reduced in either or both eyes due to ocular disease (e.g., glaucoma), or to other disorders which affect the optic pathways within the brain (e.g., a stroke).
