The visual field refers to the total area in which objects can be seen in the side (peripheral) vision as you focus your eyes on a central point.
This article describes the test that measures your visual field.
Perimetry; Tangent screen exam; Automated perimetry exam; Goldmann visual field exam; Humphrey visual field exam
How the Test is Performed
Confrontation visual field exam. This is a quick and basic check of the visual field. The health care provider sits directly in front of you. You will cover one eye, and stare straight ahead with the other. You will be asked to tell when you can see the examiner's hand.
Tangent screen or Goldmann field exam. You will sit about 3 feet (90 centimeters) away from a flat, black fabric screen with a target in the center. You will be asked to stare at the center target and let the examiner know when you can see an object that moves into your side vision. The object is usually a pin or bead on the end of a black stick that is moved by the examiner. This exam creates a map of your central 30 degrees of vision. This exam is usually used to detect brain or nerve (neurologic) problems.
Goldmann perimetry and Automated perimetry. For either test, you sit in front of a concave dome and stare at a target in the middle. You press a button when you see small flashes of light in your peripheral vision. With Goldman testing, the flashes are controlled and mapped out by the examiner. With automated testing, a computer controls the flashes and mapping. Your responses help determine if you have a defect in your visual field. Both tests are often used to track conditions that may worsen over time.
Your provider will discuss with you the type of visual field testing to be done.
How to Prepare for the Test
No special preparation is necessary.
How the Test will Feel
There is no discomfort with visual field testing.
Why the Test is Performed
This eye exam will show whether you have a loss of vision anywhere in your visual field. The pattern of vision loss will help your provider diagnose the cause.
The peripheral vision is normal.
What Abnormal Results Mean
Abnormal results may be due to diseases or central nervous system (CNS) disorders, such as tumors that damage or press on (compress) the parts of the brain that deal with vision.
Other diseases that may affect the visual field of the eye include:
- Glaucoma (increased eye pressure)
- High blood pressure
- Age-related macular degeneration (eye disorder that slowly destroys sharp, central vision)
- Multiple sclerosis (disorder that affects the CNS)
- Optic glioma (tumor of the optic nerve)
- Overactive thyroid (hyperthyroidism)
- Pituitary gland disorders
- Retinal detachment (separation of the retina in the back of the eye from its supporting layers)
- Temporal arteritis (inflammation and damage to the arteries that supply blood to the scalp and other parts of the head)
The test has no risks.
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