1. The act or power of seeing objects with the eyes: Matt and his family were able to enjoy the visions of extraordinary beauty on their summer vacation in the national parks.
2. The act or power of anticipating that which will or may come to be: Sharon's prophetic visions of what would happen with Ken's investments in his business encouraged him to proceed with his ideas.
3. An experience in which a person, thing, or event appears vividly or credibly to the mind: Although Ben's vision of the future was not actually present, he was still convinced that he had to commit himself to strive for those goals.
4. A vivid, imaginative conception or anticipation: Mary's husband had visions of wealth and glory all of which were only in his mind and not actual.

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The art of seeing things invisible.

The inability to perceive, or to see, colors: The doctor told Sam that his achromatic vision was a result of a severe congenital deficiency in color perception which might be associated with nystagmus (the involuntary rapid rhythmic movements of his eyeballs) and reduced visual acuity (loss of the ability to detect fine details or small distances with the eyes).

The doctor also indicated that he has several other patients with similar abnormal achromatic visions.

The simultaneous use of both eyes, resulting in seeing which incorporates images with depth perception.

A bluish discoloration of perceived objects or things that are seen.

1. The part of a field that is seen near an object at which the eye is directed or straight-ahead sight as opposed to peripheral seeing.
2. The physiological sense of sight by which the form, color, size, movements, and distances of objects are perceived: Central vision permits a person to read, to drive, or to perform other activities that require fine, sharp, straight-ahead viewing.

1. Color vision or the normal ability to see colors.
2. The perception and evaluation of the colors of the spectrum.
2. The ability to see or to perceive the color hues normally stimulated by the various parts fo the visible spectrum.

1. A condition related to prolonged computer monitor use; such as, people who are viewing computer screens who tend to blink less and open their eyes more widely, all of which can result in dryness of the eyes, fatigue, burning, difficulty in focusing, headaches, etc.
2. CVS is caused by the decreased blinking reflex of the eyes while working long hours focusing on computer screens.

The normal blinking rate in human eyes is about 16–20 blinks per minute and recent studies have shown that the blinking rate decreases to as low as 6–8 blinks a minute for people who are working on computer screens for long periods and this can lead to an irritating condition called dry eyes.
3. A variety of problems related to prolonged viewing of a computer screen.

Short term effects include dry eyes, blurred vision, eye fatigue and excessive tearing.

Long term effects include migraines, cataracts, and visual epilepsy.

Some solutions include keeping reflections and glare to a minimum and to provide a non-fluorescent, uniform light source.

Special lamps are available that maintain the proper light around the monitor and generate light at much higher frequencies than regular light bulbs.

Glasses Can Correct Near and Far, but What About Those Screens in Between?

1. Visual perception in the daylight or under conditions of bright illumination.
2. Vision achieved by looking directly at objects in the daylight so the image falls on or near the fovea centralis (area of most acute vision).

The fovea centralis is a shallow pit in the center of the eye retina which is free of blood vessels and has the highest concentration of cells sensitive to color and bright light cones (short, compact visual cells in the eyes).

A form of color vision in which only two special hues, or two of the three primary colors, can be seen.

The observation of an object on which the part of the retina of each eye distinguishes the fine details at the center of the field of vision that the eyes are focused on: Dr. Rebecca Bond, the ophthalmologist, determined that Joseph’s direct vision was normal because the image of the item he saw fell directly on the yellow spot, or macula lutea, of his eyes.

The fixation of the eyes with a part of the retina other than the fovea.

The fovea is located in the eye, a tiny pit located in the macula of the retina (a small spot in the eye where vision is sharpest) which provides the clearest vision of all.

Only in the fovea are the layers of the retina spread aside to let light fall directly on the cones, the cells that give the sharpest image.

A symptom of an epileptic attack, caused by a neuronal discharge from the temporal lobe, during which events from the patient's past life are seen vividly in a panoramic fashion.

This is usually an accelerated ecmnesic (loss of memory for recent events) visual hallucination.

The normal alignment of the center of the retina of the eye on the point of fixation.

1. A functional or hysterical disorder in which the field of vision is severely constricted to a small diameter, that is the same at all distances from the eye.
2. Visual impairment involving a loss of peripheral vision.
3. A condition in which peripheral vision is lost or severely limited, so that only objects directly in line with the eyes can be seen, as from within a tunnel looking out.
4. An extremely narrow point of view; narrow-mindedness.
5. A very limited viewpoint or conception of things.

1. The blindness in one half of the visual field of one or both eyes; usually applied to bilateral defects caused by a single lesion.
2. Bilateral or unilateral blindness in one-half of the field of vision; half blindness.

1. A condition in which colored or luminous rings are seen around lights.
2. The perception of rings of color or of glare surrounding lights.

The perception of two separate images, presented separately to the eyes by a stereoscopic device.

The sight perceived by the peripheral retina (the outer boundary or edge of the light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain).

A borderline ability to perform a visual function or barely able to see.

The ability to see in the "twilight range", between the photopic (eyes adapted to brighter light) and the scotopic vision (eyes adapted to low illumination or darkness).

A reference to the combination of photopic vision and scotopic vision in which there are low but not quite dark lighting situations.

Having sight with only a single eye or being able to see with just one eye.

1. A condition in which more than one image of an object is formed, or seen, on the retina.
2. A visual perception of several images of a single object.
3. Having multiple vision; the seeing of one object as more than one.

1. The ability to see in reduced illumination; as in moonlight.
2. Seeing in dim light or a type of vision that occurs at very low levels of illumination, and it can detect differences of brightness but not of hue.
3. The ability to see in the dark.

A dancing movement of objects caused by spontaneous eye movements.

The area of the visual field seen by the extramacular portions of the retina.

Extramacular refers to the outside part of the macula of the eye which is the small spot that is different from the surrounding tissue.

A visual impression that outlasts the duration of the physical stimulus giving rise to it.

This occurs as a result of a sensory lag.

A red discoloration of the vision during an adaptation to light.

1. Relating to vision with the normal eyes in bright light; for example, day vision.
2. Pertaining to vision in the light; said of the eyes which have become light-adapted.
3. Sometimes applicable to seeing what appears to be sparks in front of the eyes.

A person can recognize the transition from photopic vision to scotopic (night) vision with the disappearance of color perception, which is replaced by shades of black and white.

Reversed depth perception, as seen with a stereoscope which transposes the images seen by two eyes.

A red discoloration of the field of view.

The red discoloration of a person's vision during an adaptation to darkness.

1. Visual perception of depth which is a result partly of binocular vision and because the visual stimuli transmitted from each eye goes to both brain hemispheres.
2. The perception of depth, distance, and three dimensionality arising from binocular vision.
3. Vision in which the visual fields of the two eyes are unified.

Sensations from a common object received by the two eyes are superimposed, and as a result of the slight differences in the fields and the superimposition of the fields, the effects of depth and shape of the object are determined.

A lack of the awareness of a visual field loss.

In robotics, a system of visual feedback based on various devices; such as, video cameras, photocells, or other appliances, allowing a robot to recognize objects or to measure their characteristics.

Being aware of visual field loss.

In robotics, a device; such as, a camera, which uses reflected light to find and to identify an object and sends the information, in the form of electronic signals, to a controller.

Military ordnance, a narrow aperture (opening) in a military tank or armored vehicle to allow the crew to see outside the vehicle.