Asked by: Willem Folta
medical health eye and vision conditions

What is a normal visual field test result?

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A normal visual field is an islandofvision measuring 90 degrees temporally to centralFixation,50 degrees superiorly and nasally, and 60 degreesinferiorly.Visual acuity increases from movementdiscrimination in theextreme peripheral vision to betterthan 20/20 in the centerof vision.


Similarly, what does a normal visual field test look like?

The Visual Field A normal visual field extendsapproximately100° temporally (laterally), 60° nasally,60°superiorly, and 70° inferiorly [2].

Beside above, what is the peripheral vision of a normal person? Peripheral vision is the part of ourvisionthat is outside the center of our gaze, and it is thelargestportion of our visual field. A normal visualfield isapproximately 170 degrees around, with 100 degreescomprising theperipheral vision.

Consequently, what do the numbers mean on a visual field test?

A value of 0 means the patient could not seethebrightest target, and a 50 means the dimmest targetwasseen. Most values are around 30 dB, and anynumbersbelow this range imply a possible visualfielddefect.

Is visual field test accurate?

Reliability of visual field testing isdifficultto control and often requires repeat testing toassureaccurate results. Patient attention and ability areprimaryconsiderations, but there are many other factors thatinfluencevisual field performance.

Related Question Answers

Liubov Herice

Professional

How can I test my peripheral vision at home?

Start with a simple Confrontational VisualFieldExam.
For this peripheral vision test, youreyedoctor will sit right across from you and ask you to cover oneeye.You'll be asked to stare straight ahead while they slowly bringoneof their hands from one side into yourperipheralvision.

Francho Luca

Professional

Do I wear my glasses for visual field test?

Yes, patients can wear theirnormalglasses, contacts or a trial frame if neededduringvisiual field testing on a Matrix 800. It is okay tousebi-focal or progressive lenses. Verify that the patient's eyesarenot dilated during the visual field test, unless thepupilis less than 3 mm.

Jovanka Retolaza

Professional

What can a visual field test detect?

The test is performed by an ophthalmologist andisused to detect areas of vision loss (blindspots)caused by a brain tumor, stroke, glaucoma, diabetes,hypertension,or head trauma. It can also be used to monitortheprogression of previously known visualfieldloss.

Suri Carceles

Explainer

How do you test your blind spot?

To draw the blind spot tester on a piece ofpaper,make a small dot on the left side separated by about 6-8inches froma small + on the right side. Close your right eye. Holdthe image(or place your head from the computer monitor) about 20inches away.With your left eye, look at the +.

Tiny Negoi

Explainer

What is an Isopter?

Medical Definition of isopter
: a contour line in a representation of the visualfieldaround the points representing the macula that passes throughthepoints of equal visual acuity.

Riccardo Cenitagoya

Explainer

How do you find the field of vision?

Visual field testing is a way to measureyourentire visual field, or how much you can see to eachsidewhile focusing your eyes on a central point(peripheralvision). Conducting a visual field test iscalledperimetry. One measure of your visual function is to readletterson a visual acuity chart.

Dilcia Woodward

Pundit

How visual field test is done?

Visual Field Testing
In order to find and follow glaucoma,visualfields are measured by a computer one eye at atime. Oneeye is covered and the patient places his or herchin in atype of bowl. Lights of various intensity and size arerandomlyprojected around inside of the bowl.

Nunilon Satz

Pundit

Can Opticians see brain Tumours?

Some people may be aware that eye tests candetectcancers of the eye such as melanomas, but possibly don'tknow thatthey can also detect signs of braintumours. Dr NigelBest, says: 'Swelling of the optic nervescan be visibleduring an eye test,and can indicatethat a braintumour is present.'

Jakelin Eroshevsky

Pundit

What does an abnormal visual field test mean?

Also, a visual field test may detect centralorperipheral retinal disease, some eyelid conditions includingptosis(drooping eyelid), optic nerve disease, and diseasesaffecting thevisual pathways within the brain. Potentialcauses of anabnormal visual field test result include thefollowing:Glaucoma. Diabetes.

Carman Ekstedt

Pundit

What is a normal field of vision?

A normal visual field is an islandofvision measuring 90 degrees temporally to centralFixation,50 degrees superiorly and nasally, and 60 degreesinferiorly.Visual acuity increases from movement discrimination inthe extremeperipheral vision to better than 20/20 in thecenter ofvision.

Sole Aubeso

Pundit

What is a false positive on a visual field test?

False positive errors occur if patientsrespondwhen no stimulus is presented. Fixation losses occur whenthepatient's eye wanders from the fixation target. The methodofmeasuring these error rates has been to present“catchtrials” during the visualfieldtest.

Naual Kaminski

Teacher

What can a visual field test show?

The visual field test is a subjective measureofcentral and peripheral vision, or “side vision,” andisused by your doctor to diagnose, determine the severity of,andmonitor your glaucoma. The most common visual fieldtestuses a light spot that is repeatedly presented in differentareasof your peripheral vision.

Tijana Pavlishin

Teacher

What is a nasal step visual field defect?

The nasal visual field was examined bothwithkinetic and static perimetry. The nasal step can beaphysiological sign of the anatomic and functional asymmetry oftheretina. In this case it is of a small degree andchangeable.Sometimes it is an artifact. The nasal step canalso be aglaucomatous defect.

Kieran Griebel

Teacher

What is Visual Field Index?

TREND-BASED PROGRESSION TOOLS
Visual Field Index (VFI) is a globalindexthat assigns a number between 1% and 100% based on anaggregatepercentage of visual, function with 100% being aperfectage-adjusted visual field.

Everett Vlad

Teacher

What percentage of glaucoma patients has resulting blindness?

Fortunately for most patients the answerisno. Blindness does occur from glaucoma butitis a relatively rare occurrence. There are around120,000cases of blindness in the United States and 2.3millioncases of glaucoma. This represents about 5% ofglaucomapatients.

Aziz Utenwiehe

Reviewer

What is scotoma eye?

Specialty. Ophthalmology. A scotoma is an areaofpartial alteration in the field of vision consisting of apartiallydiminished or entirely degenerated visual acuity that issurroundedby a field of normal – or relatively well-preserved–vision.

Sarina Sathianarayan

Reviewer

What is the horizontal field of vision?

The diagram above depicts the normal horizontalfieldof vision, including the location of the blind spots forbotheyes. In a normal person, the field of vision shouldspan atotal width of 190 degrees.

Alin Bass

Reviewer

Can you drive with peripheral vision loss?

You must notify the Driver and VehicleLicensingAgency (DVLA) of any medical condition which may affectsafedriving. Loss of vision in oneeye,loss of peripheral vision (visualfield) anddouble vision can severely affect your abilitytodrive, even though you may pass the numberplatetest.

Sha Castner

Reviewer

What happens when you lose your peripheral vision?

A common cause of loss ofperipheralvision (also called a peripheral fielddefect) is opticnerve damage from glaucoma. Eye "strokes"(occlusions) that blocknormal blood flow to the eye'sinternal structures,including the optic nerve, also can leadto loss ofperipheral vision.

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1st May, 2020

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