Visual field testing is a method of measuring not only central vision, but a patient’s entire scope of vision. Importantly, VFT can detect vision loss that may be unnoticed otherwise. It is very useful in monitoring glaucoma patients and those with damage to the visual pathway within the brain. VFT is also useful to assess the vision in macular disease and optic neuropathy.
During this test the patient looks at a central target. The perimetry test will briefly flash small lights on a white background. The patient presses a button whenever a light is seen. A computer assesses the entire field of vision and patterns of visual field loss can then be detected and measured. The test typically lasts 6-10 minutes per eye, and there are no associated risks.