The useful field of view (UFOV) refers to the spatial region from which meaningful visual information can be processed during a single fixation. Unlike the anatomical visual field, UFOV is dynamically modulated by attention allocation. It narrows with aging, increased cognitive load, and fatigue, and is associated with driving ability and visual search efficiency.
Definition and Distinction from Anatomical Visual Field
The useful field of view (UFOV) is the spatial region from which visual information can be meaningfully processed during a single eye fixation. While the human anatomical visual field extends approximately 180 degrees horizontally, the UFOV is limited to the area where attention reaches and meaningful information extraction occurs. Central vision provides high-resolution detail, but peripheral resolution is lower. UFOV is a cognitive concept that dynamically expands or contracts based on attentional resource allocation, beyond these physical constraints.
Factors That Narrow the Useful Field of View
Multiple factors cause UFOV contraction. Aging is one of them. When central task difficulty increases, attentional resources concentrate on the fovea, reducing peripheral processing capacity - a tunnel vision effect. Fatigue, sleep deprivation, and alcohol consumption also narrow UFOV. Conversely, one study reported that non-players who trained on an action video game improved on several measures of visual attention.
Measurement in Cognitive Tests and Practical Significance
UFOV assessment uses a dual-task paradigm: participants perform a central identification task while detecting briefly presented peripheral targets. This metric has been studied as a predictor of automobile crash risk: in a study that followed older drivers, those with substantial UFOV impairment were more than twice as likely to be involved in a crash.