A visual field test measures how far and how sensitively a person can see in different directions while looking straight ahead. It is central to the assessment of glaucoma and many neurological disorders.
How the test works
In automated perimetry, small lights of varying brightness appear at multiple locations, and the patient presses a button when each is seen. The machine builds a sensitivity map that highlights areas of loss.
- Commonly used to diagnose and monitor glaucoma
- Helps localise lesions in the visual pathway from eye to brain
- Reliability indices show whether the test performance was adequate
- Serial fields are compared to detect progression
