Davis's Lab & Diagnostic Tests
Visual Fields Test
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General
Synonym/Acronym:
Perimetry, VF.
Rationale
To assess visual field function related to the retina, optic nerve, and optic pathways to assist in diagnosing visual loss disorders such as brain tumors, macular degeneration, and diabetes.
Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Normal Findings
- Normal central vision field extends in a circle approximately 25 to 30 degrees on all sides of central fixation and out 60 degrees superiorly (upward), 60 degrees medially (nasally), 75 degrees inferiorly (downward), and 90 degrees temporally (laterally). There is a normal physiological blind spot, 12° to 15° degrees temporal to the central fixation point and approximately 1.5 degrees below the horizontal meridian, which is approximately 7.5 degrees high and 5.5 degrees wide. The patient should be able to see the test object throughout the entire central vision field except within the physiological blind spot.
Critical Findings and Potential Interventions
N/A
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General
Synonym/Acronym:
Perimetry, VF.
Rationale
To assess visual field function related to the retina, optic nerve, and optic pathways to assist in diagnosing visual loss disorders such as brain tumors, macular degeneration, and diabetes.
Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Normal Findings
- Normal central vision field extends in a circle approximately 25 to 30 degrees on all sides of central fixation and out 60 degrees superiorly (upward), 60 degrees medially (nasally), 75 degrees inferiorly (downward), and 90 degrees temporally (laterally). There is a normal physiological blind spot, 12° to 15° degrees temporal to the central fixation point and approximately 1.5 degrees below the horizontal meridian, which is approximately 7.5 degrees high and 5.5 degrees wide. The patient should be able to see the test object throughout the entire central vision field except within the physiological blind spot.
Critical Findings and Potential Interventions
N/A
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