Visual field test
Visual Field Test
A Visual Field Test (pronounced: /ˈvɪʒ.uː.əl fiːld tɛst/) is a method used by eye care professionals to measure an individual's entire scope of vision, that is, their total area of vision, both central and peripheral. This test can detect blind spots (scotomas) and other localized visual field defects, which can be early signs of eye diseases such as glaucoma.
Etymology
The term "Visual Field Test" is derived from the words "visual" (from Latin visus, past participle of videre "to see"), "field" (from Old English feld "open country") and "test" (from Old French test "small vessel").
Procedure
The Visual Field Test is typically performed with a perimetry test. During this test, the patient sits and looks straight ahead at a fixed point in a machine. Lights are flashed on, and the patient presses a button whenever they see the lights. The machine then maps the patient's visual field.
Related Terms
- Perimetry: The systematic measurement of visual field function.
- Scotoma: An area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision.
- Glaucoma: A group of eye diseases which result in damage to the optic nerve and cause vision loss.
See Also
External links
- Medical encyclopedia article on Visual field test
- Wikipedia's article - Visual field test
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