Abnormal Visual Fields

Abstract

An abnormal visual field refers to the condition of clinically and statistically significant light sensitivity deviation at various points in the visual field from the normal island of vision. It can be manifested as localized or general sensitivity change (Figs. 11.1, 11.2, and 11.3). Defect area and severity (in dB value of sensitivity) are usually adopted to describe such changes. A visual field defect has many manifestations and is closely related to the pathways of the whole nerve fibers and the lesion location. The manifestations of visual field will be different according to the damage location and pathology. Therefore, the patterns of visual field defects have important clinical significance in localization diagnosis, and they will be described in detail later in this chapter.