The area which can be seen without moving the eye.
Area in front of the eye, in which an object can be seen without moving the eye.
The total area a person can see when looking straight ahead. A normal visual field is 180 degrees, or a half-circle. The visual field is measured in a standard eye examination. Visual field testing is useful for diagnosing and evaluating diseases that can limit or impair the field of vision, such as glaucoma, multiple sclerosis, stroke, or a tumor in the brain.
The area in front of the eye in any part of which an object can be seen without moving the eye. With both eyes open and looking straight forward it is possible to see well-illuminated objects placed anywhere in front of the eyes, although the eyebrows and eyelids reduce the extent of the field somewhat. This is the binocular visual field. With only one eye open the field is uniocular and is restricted inward by the nose. If the object is small or poorly illuminated it will not be seen until it is moved closer to the point at which the eye is actually looking, i.e. nearer to the center of the visual field. Similarly, colored objects are not seen so far away from the center as are white objects of the same size and brightness. This is because the retina is not uniformly sensitive to light of different colors or intensities: retinal sensitivity increases toward its center (the macula). Thus, while there is an absolute visual field beyond which things cannot be seen, no matter how large or bright they are, a relative field exists for objects of different brightness, size, and color.
The area within which objects may be seen when the eye is fixed.
The extent of area where a person can perceive visually while looking directly forward is known as the visual field. Normally, this area extends about 90 degrees to each side from the center of the face. However, it may be more limited vertically, particularly if the eyes are recessed or the eyebrows are prominent. The visual fields of both eyes largely overlap, providing binocular vision. Reduced visual field can occur in conditions like glaucoma, where there’s increased pressure within the eyeball, or following a stroke.
The region of space that is within the field of view of the stationary eye.
The portion of space that is within the field of view of the stationary eye.