What does a visual field test primarily assess?

A visual field test is designed to assess the extent of a patient’s peripheral vision. This type of test measures the range of vision around the individual, identifying any blind spots or areas where vision may be diminished. Assessing peripheral vision is crucial for diagnosing various eye conditions and neurological disorders, as the ability to detect objects outside the central line of sight is vital for overall visual performance and safety.

Understanding the significance of peripheral vision helps in appreciating why this assessment is important for conditions like glaucoma or optic nerve issues, which can affect side vision before impacting central vision. The other options, while related to vision, pertain to different aspects of visual function, and do not encompass the primary focus of a visual field test, which is specifically centered on the assessment of peripheral vision capabilities.