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Topic: Peripheral vision


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  Correctional Officer Vision
Peripheral Vision is the ability to perceive objects, movement or sharp contrasts toward the edges of the visual field.
Peripheral vision is the ability to see these contrasts and gross movements such as in noticing if a car is coming at you from the extreme right or extreme left as you cross the street.
The original study examined corrections and police vision research and concluded that law enforcement vision requirements could not be transported to the fire service for a variety of reasons including the fact that firefighters do not have to make shoot no-shoot decisions with lethal weapons.
home.earthlink.net /~medtox/correct.html   (2959 words)

  
  Peripheral vision: Just the facts...   (Site not responding. Last check: 2007-10-18)
Peripheral vision is that part of vision (A vivid mental image) that occurs at the edges of the field of view (The area that is visible (as through an optical instrument)).
Peripheral vision is weak in human (Any living or extinct member of the family Hominidae) s, especially at distinguishing color (A visual attribute of things that results from the light they emit or transmit or reflect) and shape.
Peripheral vision is good at detecting motion (a feature of rod cells), however, and is relatively strong at night or in the dark, when the lack of color cues and lighting makes cone cells far less useful.
www.absoluteastronomy.com /encyclopedia/p/pe/peripheral_vision.htm   (193 words)

  
 Encyclopedia: Peripheral vision   (Site not responding. Last check: 2007-10-18)
Peripheral vision is that part of vision that occurs outside the very center of gaze.
Vision Color vision is the capacity of an organism or machine to distinguish objects based on the wavelength of the light they reflect or emit.
Peripheral vision is good at detecting motion (a feature of rod cells), and is relatively strong at night or in the dark, when the lack of color cues and lighting makes cone cells far less useful.
www.nationmaster.com /encyclopedia/Peripheral-vision   (980 words)

  
 Encyclopedia - Peripheral Vision
Peripheral vision, or side vision, is that part of vision that detects objects outside the direct line of vision.
Normal peripheral vision, called visual field, for one eye is approximately 150 degrees from side to side.
However, many low vision aids are available for people who have lost all or a portion of their peripheral vision.
www.visionrx.com /library/enc/enc_peripheralvision.asp   (651 words)

  
 Effects of Refractive Error on Detection Acuity and Resolution Acuity in Peripheral Vision
The large depth-of-focus for resolution acuity measured for peripheral vision indicates that spatial resolution is likely to remain sampling-limited even when peripheral refractive errors are not fully corrected, thus relaxing the methodological requirements for obtaining non-invasive estimates of neural sampling density of the living eye in a clinical setting.
These experiments have shown that in peripheral vision, unlike foveal vision, acuity for detecting the presence of a sinusoidal grating is much higher than acuity for resolving the grating's orientation, or the direction of motion when drifting.
Refractive state of the eye for the peripheral target was manipulated without inducing changes in accommodation by introducing an ophthalmic trial lens into the line of sight for the stimulus, but not for the fixation target.
research.opt.indiana.edu /Library/RefractErrOnAcuity/RefractErrOnAcuity.html   (6397 words)

  
 Vision Conditions
Peripheral or side vision is the field of view that surrounds the central portion of the vision field.
Peripheral vision impaired by one or more vision conditions can result in the driver failing to react to a hazard coming from the driver's far left or far right, failing to heed a stop light suspended over an intersection, weaving while negotiating a curve, and/or driving too close to parked cars.
Glare is the disruption of vision due to a veiling luminance (such as the light from the headlights of oncoming traffic at night) being superimposed on the visual image (such as the outline of the car ahead of you).
www.dmv.ca.gov /dl/driversafety/vision_cond.htm   (1258 words)

  
 About Vision
Vision therapy, an optometric specialty treatment, has been clinically shown to be an effective treatment for accommodative disorders (non-presbyopic eye focusing problems), binocular dysfunction (inefficient eye teaming), ocular motility dysfunctions (eye movement disorders), strabismus (turned eye), amblyopia (lazy eye), and perceptual-motor dysfunction.
Optometric vision therapy is a set of procedures that are individualized and prescribed by an optometrist to teach a patient how to improve a weak or nonexistent visual skill or processing skill through the use of lenses, prisms, special computer programs, and other treatment techniques.
Please note that vision therapy is a treatment to improve a specific vision disorder; it is not a treatment for dyslexia, learning disabilities, or attention deficit disorder.
www.vision-therapy.com /About_Vision.htm   (2295 words)

  
 The Effect of Window Size on Detection Acuity and Resolution Acuity for Sinusoidal Gratings in Central and Peripheral ...
Of particular importance for peripheral vision is the possibility that some of the spurious components introduced by windowing might exceed the Nyquist frequency of the retinal mosaic and lead to aliasing, perhaps affecting the resolution of other frequency components in the stimulus.
For peripheral experiments, the subject fixated an illuminated cross at a distance of 3m whilst peripherally viewing the stimulus, which was also located 3m from the observer but displaced 30º along the horizontal meridian into the temporal field.
For foveal vision the results were indistinguishable for the two psychophysical tasks, but for peripheral vision we found detection acuity was always superior to resolution acuity, provided there was at least one cycle visible in the stimulus.
research.opt.indiana.edu /Library/WinSizeOnAcuity/WinSizeOnAcuity.html   (6039 words)

  
 Vision Aids for Impaired Peripheral Vision or Tunnel Vision
A person's peripheral vision loss may be slowed, arrested or even reversed with timely and effective medical treatment.
The person has visual acuity correctible to 20/40 or better and sees clearly using his or her "central vision." If best corrected acuity is 20/70 or poorer, the person should go to a “Low Vision Clinic” and request that both problems be addressed: (a) the reduced acuity … and then (b) the reduced visual fields.
If binocular vision can be established, for both direct viewing and for seeing through two, centered, parallel tubular FX devices, then the person may retain functionally better visual acuity with the two eyes than with either eye alone.
www.abledata.com /abledata_docs/Peripheral_Vision.htm   (6140 words)

  
 AUGMENTED VISION FOR CENTRAL SCOTOMA AND PERIPHERAL FIELD LOSS
I propose a novel concept of augmented vision, which is based on a new method of enhancement and the use of open peripheral-view, see-through display devices.
Peripheral field loss (tunnel vision) is a severe constriction of the peripheral field leaving only the central 5-10 deg.
I contend that most of the limitations of current low vision devices are due to the concentration on the missing component, without sufficient attention to the need to also reconstruct the interplay of central and peripheral vision as well as the use of eye movements.
www.eri.harvard.edu /faculty/peli/papers/vision99/Augment.html   (2863 words)

  
 The Power of Peripheral Vision by Andy Smith
An interesting feature of peripheral vision is that clients who normally have an internal dialogue or commentary going generally find that it slows down or stops when they go into peripheral vision.
In subsequent sessions he said that he was continuing to use peripheral vision to relax even though the panic attacks had ceased, partly as a preventative measure and partly so that he remained confident that if panic attacks ever did recur, he had a powerful method of controlling his own state and remaining calm.
Like any other technique, there are always going to be a handful of clients for whom peripheral vision is not the right thing to use; and as with any other technique, you have to pay attention to the client and notice what is happening.
www.trance.dircon.co.uk /powerofperipheral.html   (3007 words)

  
 Coping with Low Vision - AllAboutVision.com
Low vision is a term commonly used among eyecare professionals to mean partial sight, or sight that isn't fully correctable with surgery, pharmaceuticals, contact lenses or glasses.
Vision can be hazy with cataracts, blurred or partially obscured in the central visual zone with macular degeneration, and distorted or blurred with diabetic retinopathy.
If you are having any difficulty seeing — hazy or blurred vision, light sensitivity, loss of peripheral vision, night blindness, a need for more light than before, color confusion, unusual floaters or spots or difficulty in reading — see an eyecare professional for a complete exam.
www.allaboutvision.com /lowvision/low_vision.htm   (607 words)

  
 Peripheral Retina
The peripheral retina is defined as the zone from the equator to the ora serrata and is approximately three to four disc diameters
The main symptom of this condition is reduced vision from age 30 to 40 with a slow progression to 20/200 or worse with aging.
Peripheral vision remains intact and there is no complaint of night blindness.
www.opt.indiana.edu /riley/HomePage/Peripheral_Retina_Lecture/MSW_Peripheral_Retina.html   (3984 words)

  
 peripheral vision   (Site not responding. Last check: 2007-10-18)
I just wanted to comment on the peripheral vision aspect of your post--- My son's big stimming is looking out of his peripheral vision (especially at linear things (ledges, fences--- but pretty much everything is a possibility).
Looking out of the peripheral vision is a common stim but I am sure some "normal" kids may do it too.
He still looks out of the peripheral vision several times a day(especially if tired or stressed) but most often he would rather play with his sister or interact with us.
www.autismweb.com /_disc/00000b00.htm   (149 words)

  
 Article of headwear providing supplemental wide angle peripheral vision - Patent 4704014
Humans operating in space and underwater are at a distinct sensory disadvantage because environmental conditions and conventional protective head gear tends to restrict the visual field of view and at the same time renders the senses of hearing, smell and touch useless.
The intent is not to expand or modify the function of normal binocular vision but to supplement it with an extreme wide angle peripheral viewing system which can be positioned so as to minimally restrict normal human vision.
Placement of the supplementary wide angle viewing device 15, away from the normal field of vision is important because it makes use of normal binocular vision functions when focusing on either the right or the left hemispherical view.
www.freepatentsonline.com /4704014.html   (2528 words)

  
 Peripheral Vision Psychosis
The facts of human physiology involving subliminal sight and peripheral vision reflexes are so bizarre that even college students in psychology classes have a hard time believing them the first time they hear them.
It was placed so that as she worked she would subliminally detect movement in peripheral vision as staff came to the coffee service table.
When the subliminal stimulation from a failed peripheral vision reflex is perceived as reinforcement for contemporaneous activity, positive or negative reinforcement, operant conditioning happens.
www.visionandpsychosis.net   (5114 words)

  
 Webvision: Simple Anatomy of the Retina
A circular field of approximately 6 mm around the fovea is considered the central retina while beyond this is peripheral retina stretching to the ora serrata, 21 mm from the center of the optic disc.
However in the peripheral the rod cell bodies outnumber the cone cell bodies while the reverse is true for central retina.
The latter layer is absent in peripheral retina.
webvision.med.utah.edu /sretina.html   (3357 words)

  
 Peripheral Vision
The fact that our vision has the highest acuity in the center of gaze does not mean that our vision in the rest of the visual field is inferior — it’s simply used for different things.
Foveal vision is used for scrutinizing highly detailed objects, whereas peripheral vision is used for organizing the broad spatial scene and for seeing large objects.
Our foveal vision is optimized for fine details, and our peripheral vision is optimized for coarser information.
webexhibits.org /colorart/ag.html   (253 words)

  
 MACULAR DEGENERATION   (Site not responding. Last check: 2007-10-18)
In macular degeneration, the lateral vision is not affected.
This exam is used to assess the extension of the area of altered vision.
They center the worst part of their vision, positioning their blind spot right in the middle of what they want to see most.
www.randeye.com /macdegen.htm   (1772 words)

  
 EETimes.com - Heads-up displays get peripheral vision   (Site not responding. Last check: 2007-10-18)
Peripheral vision occupies a fuzzy region around the edges of the visual field, and is routinely used by people driving and playing sports to provide cues about speed, vertical orientation (roll-about-the-line-of-sight, called "attitude" by pilots) and heading.
For instance, when driving a car in heavy traffic, the central part of the visual field is fixed on the car in front of you, which is at rest with respect to your car-since you are both driving at approximately the same speed.
The addition of peripheral vision to such night-vision-equipped vehicles could also impart speed information that is almost totally lacking in the dark.
www.eetimes.com /story/OEG19981109S0021   (691 words)

  
 The Rods and Cones of the Human Eye
The optimum dark-adapted vision is obtained only after a considerable period of darkness, say 30 minutes or longer, because the rod adaption process is much slower than that of the cones.
Since the rods predominate in the peripheral vision, that peripheral vision is more light sensitive, enabling you to see dimmer objects in your peripheral vision.
If you see a dim star in your peripheral vision, it may disappear when you look at it directly since you are then moving the image onto the cone-rich fovea region which is less light sensitive.
hyperphysics.phy-astr.gsu.edu /hbase/vision/rodcone.html   (1039 words)

  
 The College of Optometrists in Vision Development   (Site not responding. Last check: 2007-10-18)
Once central focus is gained, they ignore peripheral vision and remain fixated on a task for excessive periods.
Vision therapy activities are used to stimulate general visual arousal, eye movement and the central visual system.
The goals of the treatment program using lenses, prisms and vision therapy are to help the individual organize visual space and gain peripheral stability so that he or she can better attend to and appreciate central vision.
www.covd.org /art/visionautism.html   (551 words)

  
 InteliHealth:
Glaucoma is a common eye condition in which vision is lost because of damage to the optic nerve.
Peripheral vision (at the edges) is usually lost first, especially the field of vision near your nose.
As larger areas of your peripheral vision fade, you may develop tunnel visionvision that has narrowed so you see only what is directly in front of you, like looking through a railroad tunnel.
www.intelihealth.com /IH/ihtIH/WSIHW000/8779/24207/197365.html?d=dmtHealthAZ   (1363 words)

  
 John's Ideas and Creativity: Peripheral Viewing: harnessing peripheral vision as a creative tool.
Put simply, Peripheral Viewing is when the creative (ideas person, inventor etc) selects an image, ensures they do not look directly at the image (by choosing a focus spot away from the image) and tries to guess/deduce the content of the selected image.
To Peripheral View, the creative focuses and fixes their gaze on a ‘Focus Spot’ on the page of images.
Obviously the Peripheral Viewing technique is relevant to the Global Ideas Bank and relevant to social invention.
johnideas.blogspot.com /2005/02/peripheral-viewing-harnessing.html   (1567 words)

  
 Peripheral Vision   (Site not responding. Last check: 2007-10-18)
Compound grating discrimination was measured in normal foveal and extrafoveal vision as well as in central vision of amblyopic subjects.
For narrow ribbons, the peripheral 'template' for ribbon Vernier acuity is not as well matched to the stimulus (in two-dimensional spatial frequency space) as the foveal 'template'.
Relative roles of resolution and spatial interference in foveal and peripheral vision.
www.bradford.ac.uk /acad/lifesci/optometry/research/projects/PeriVis.htm   (1866 words)

  
 Sports Vision Tests and Therapies - AllAboutVision.com
Eye-foot coordination is important for soccer and tennis players, while peripheral vision is crucial for basketball.
Peripheral awareness is the ability to perceive what's going on at either side of you without turning your head.
To test your peripheral vision, a specialist may have you view a slide straight ahead while flashing other images at various angles off to the side.
www.allaboutvision.com /sportsvision/treatment.htm   (775 words)

  
 What is Peripheral Vision Psychosis
The explanation she gave was that as the victim continues to ignore repeating vision reflexes a conflict arises in the mind then builds to a mental break.
While there is no reason to believe the stimulus to cause a vision reflex has a complex meaning, we have all experienced the effect of a vision caused startle.
Those vision blocking panels were added because some of the workers using the first design examples had begun to have mental breaks.
www.visionandpsychosis.net /what_is_Subliminal_peripheral_vision_psycho.htm   (3098 words)

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