The<unk>  is the "spatial array of visual sensations available to observation in introspectionist psychological experiments". Or simply,<unk>  can be defined as the entire area that can be seen when an eye is fixed straight at a point. The equivalent concept for optical instruments and image sensors is the<unk>  of view (FOV). In optometry, ophthalmology, and neurology, a<unk>  test is used to determine whether the<unk>  is affected by diseases that cause local scotoma or a more extensive loss of vision or a reduction in sensitivity (increase in threshold).
Visual field
Color vision
Neurological pupil index
Monocular vision
Supplementary eye field
Visual acuity
X-ray vision
Eye chart