What Is a 24-2 Visual Field Test
The name “24-2” comes from the visual field area and pattern spacing it covers. The “24” means the test covers the central 24 degrees of your vision...
24-2 Visual Field Test
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24-2 visual field test
A 24-2 visual field test is a common eye exam that measures how well you see in the area around the center of your gaze. During the test you look straight ahead at a fixed point and press a button whenever you see a small light appear in different spots. The machine flashes lights at many locations within about 24 degrees from the center to map sensitivity across that central area. The test creates a map showing where vision is full and where there are weak spots or gaps. It is often done one eye at a time and takes several minutes per eye. This exam matters because many eye and brain conditions cause loss of side or central vision before other symptoms appear. Doctors use it to detect and track diseases like glaucoma, optic nerve problems, retinal disease, and some brain disorders. The measurements are quantitative, so repeat tests can show if vision is stable or getting worse over time. Knowing the pattern and depth of vision loss helps doctors choose and adjust treatments and advise about daily activities like driving.