Visual Field Test

A visual field test measures your entire scope of vision — both central and peripheral (side) vision. It maps what you can see straight ahead, as well as above, below, and to either side of you when you are looking straight ahead. This test is essential for detecting blind spots (scotomas), peripheral vision loss, and subtle changes in vision that may not be noticeable in daily life but can indicate serious eye or neurological conditions.

During the test, you sit in front of a bowl-shaped instrument called a perimeter. One eye is covered at a time, and you focus on a central target. Small lights of varying brightness flash at different locations within the bowl, and you press a button each time you see a light. The test maps your responses to create a detailed chart of your visual field. The procedure is painless and takes approximately 15 to 20 minutes for both eyes. Some patients find it slightly tiring because it requires concentration, but there are no side effects.

Visual field testing is crucial for diagnosing and monitoring glaucoma, as the disease typically causes gradual loss of peripheral vision before affecting central vision. Early detection through regular visual field tests allows treatment to begin before significant vision is lost. The test is also used to detect retinal diseases such as retinitis pigmentosa, optic nerve disorders including optic neuritis, brain tumors or strokes that affect the visual pathways, and to evaluate the effects of certain medications on vision.

For patients with diagnosed glaucoma, visual field tests are typically repeated every 6 to 12 months to monitor for progressive vision loss. Comparing results over time helps your doctor determine whether your treatment is working effectively or if adjustments are needed.

At International Eye Hospital, our advanced automated perimetry equipment provides precise, reproducible visual field measurements, enabling early detection and careful monitoring of conditions that threaten your sight.