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Asked by: Aridany Poshibalov
medical health eye and vision conditionsHow do you test visual fields?
Last Updated: 22nd January, 2020
Visual Field Testing
In order to find and follow glaucoma,visualfields are measured by a computer one eye at a time.One eye iscovered and the patient places his or her chin in a typeof bowl.Lights of various intensity and size are randomly projectedaroundinside of the bowl.Click to see full answer.
Similarly, it is asked, what is a normal visual field test result?
The Visual Field A normal visual field extendsapproximately100° temporally (laterally), 60° nasally,60°superiorly, and 70° inferiorly [2]. A physiologicscotoma (ablind spot) exists at 15° temporally where the opticnerveleaves the eye.
Furthermore, what does a normal visual field look like? Normal visual field. A normal visualfieldis an island of vision measuring 90 degreestemporally tocentral Fixation, 50 degrees superiorly and nasally,and 60 degreesinferiorly. Visual acuity increases frommovementdiscrimination in the extreme peripheral vision tobetterthan 20/20 in the center of vision.
Secondly, 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.
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.