field of vision

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field of vision

n. pl. fields of vision
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


1. An open expanse of land.
2. A discipline or an area of study.
3. A region of space in which a given force operates or a given condition exists.
4. A place of natural conditions, as opposed to a controlled environment, such as a laboratory or a hospital.

auditory field

The spatial region in which a given person can hear sounds.

cortical field

A segment of the cerebral cortex that carries out a given function. For example, the front of the parietal lobe -- the postcentral gyrus -- can be called a primary somatosensory field, and the parietal cortex farther back can be called an association field.

dry field

A colloquial term for a bloodless surgical field in which the surgeon's vision is not obscured.

electric field

The region in space in which the attractive or repulsive effects of a given electric charge have an effect.

electromagnetic field

Abbreviation: EMF
The region in space in which the photons produced by moving electric charges have an effect. EMFs can be produced by power lines, radio waves, and microwaves. The energy produced in an EMF increases as the frequency of the photons increases, and EMFs produced by very high frequency photons (e.g., xrays and gamma rays) are sufficiently energetic to induce cancer.

eye field

Any region of the cortex concerned with sensation from or movement of an eye.

field of fixation

The widest limits of vision in all directions within which the eyes can fixate.

field of Forel

One the layers of axons -- many originating in the globus pallidus -- that form the lower (inferior) border of the thalamus in the brain. Together, the axons and neighboring neuronss are called the subthalamic reticular nucleus.
Synonym: Forel's field, prerubral field

free field

A space in which there are no surfaces that reflect specific frequencies of sound.

gradient-induced electric field

An electric field that may surround an object placed in a rapidly changing magnetic environment, such as one generated by a magnetic resonance imaging device.

gravitational field

The region in space in which the attractive effects of a given mass have an effect.

hand field

Any region of the cortex concerned with sensation from or movement of a hand.

heart field

The region of the embryo destined to produce the heart.

high-power field

The portion of an object seen when the high-magnification lenses of a microscope are used.

hippocampal field

Any of the three contiguous, but histologically distinguishable, sheets of cells that form the cortex of the hippocampus; the fields are usually called CA1, CA2, and CA3.

low-power field

The portion of an object seen when the low-magnification lenses of a microscope are used.

lung field

The region in the body containing a lung. Often, 'lung field' refers to the section of a medical image (e.g., chest xray) that shows a lung.

magnetic field

The space permeated by the magnetic lines of force surrounding a permanent magnet or coil of wire carrying electric current.

prerubral field

Field of Forel.

pulsing electromagnetic field

Abbreviation: PEMF
An alternating electrical current used to produce an electromagnetic field. This may induce healing when applied to a fractured bone. The field is applied noninvasively to the affected limb. It may be moderately helpful in treating bony nonunion. See: diathermy

receptive field

A description of the effective stimuli of a given neuron. For sensory receptor neurons, the receptive field is the type of effective stimulation (e.g., light, sound, mechanical pressure) and the range of sensitive locations (e.g., center of visual field, left auditory field, tip of right thumb).

sterile field

A body surface, along with surrounding drapes or towels, within which an operation may safely take place without introducing potentially hazardous microorganisms into a patient.

Patient care

The field is prepared by meticulously washing and scrubbing the patient on whom an operation will be performed with disinfectant solution. Sterile drapes and towels are placed over the patient to cover any unprepared skin or clothing with sterilized fabric. All surgical instruments that enter the operative theatre are cleansed according to decontamination and sterilization practices. Finally, all surgical personnel scrub for prescribed time periods with disinfectants before entering the operating room. They must wear sterile gloves, gowns, masks and shoe covers and replace these if any of them contact nonprepared items during surgery.

surgical field

The area in which an operation is performed. This field is prepared and covered to maintain sterility during operations.

useful field of view

Abbreviation: UFOV
A test of visual attention that measures the space in which an individual can receive information rapidly from two separate sources. It is a strong predictor of accidents in older drivers. Training can expand the useful field of view and increase the visual processing speed of an elderly person.

field of vision

Visual field.
Enlarge picture

visual field

The area within which objects may be seen when the eye is fixed.
Synonym: field of vision See: illustration; perimetry
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
The insect-inspired technology provides the tracking system with 120 degree field of vision eliminating the need for accompanying hardware, which helps to minimise size and weight, while reducing maintenance costs.
An ocular migraine may start out as a small shimmering spot in the center of your vision that expands into a zig-zag pattern (or a silvery swath of light), eventually covering your entire field of vision, then "travels" to one side and disappears, usually within 15-30 minutes.
Vision is described in terms of visual acuity and field of vision Visual acuity is a measure of how well an individual sees compared with someone with normal sight--for example, a person with 20/60 vision must be within 20 feet of an object to see it as clearly as a normal-sighted person at 60 feet--and a normal field of vision is 160 to 170 degrees.
Give them time and you'll witness these works bring their context into your field of vision: Italian light on Italian walls.
A Western psychologist's view of the mandala: "It is meant to aid concentration by narrowing down the psychic field of vision and restricting it to the center.
My breath is hot from impatience, which ensures me a round field of vision, protecting me from leucoma.
Some people go years, or whole lifetimes, without considering a thing out of their narrow field of vision. World debt, abject poverty; "Yeah, but how does it affect me?
We have to recognize our gaze, the one-way exercise of power that renders those in our field of vision as objects.
Phinney has a 270-degree field of vision. "I'm surrounded by people on three sides, so it speaks of a community speaking together rather than the traditional nave, which is a top-down, linear authority and structure."
US firm Microvision has brought to market a system, licensed from a patent that came out of research done at the University of Washington, that projects lasers directly onto the retina, allowing users to view images on top of their normal field of vision. The first generation product, called the Nomad Expert Technician System, is being used in the car industry, with Honda using it in dealerships.
Technical changes approved by Euro MPs in Strasbourg will mean manufacturers have to increase the field of vision for drivers of cars, buses and lorries.
Crane then contextualizes Simmel's field of vision itself, suggesting his conclusions might be skewed because he unwittingly limited his observations to those working-class people most often visible to the middle class: skilled male and unmarried female workers.