What is a visual field test?
It maps your peripheral vision by presenting lights at different positions while you look straight ahead and press a button when you see one. It is used mainly to monitor conditions that affect side vision, particularly glaucoma, where the field can narrow before a patient notices anything.
- Subject
- Surgery journey
- Topic
- Eye tests & scans
- Kind of question
- What is…
- Last reviewed
- 22 September 2026
In more detail
Because it depends on your attention and reaction, a single result is read together with previous ones. A field test that looks slightly worse than last time is often a tired afternoon rather than a change, and a series of results over years is what shows a trend.
What this answer depends on
- How rested and attentive you are during the test
- Whether you have had the test before, for comparison
- Whether the result matches the pressure and optic nerve findings
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Where this answer sits
It is one of 483 answers in the vision and eye health knowledge base, filed under The surgery journey in Eye tests & scans . The subject page carries the answers either side of it, and the hub is searchable.
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This information is for educational purposes and does not replace an examination by a qualified eye-care professional.
General answers cannot tell you what is happening in your own eyes. Only an examination by a qualified ophthalmologist can do that.
Sources & further reading
We prefer primary sources. Where a claim comes from a manufacturer, a single study or a regulator, it is labelled as such below.
- Cataracts in adults: management (NG77)
Clinical guidance on when cataract surgery is indicated, what should be discussed before it, and what follow-up is expected.
Used for When cataract surgery is considered appropriate rather than cosmetic timing; What patients should be told before cataract surgery.
Link checked 23 September 2026
- EyeSmart: eye health information for the public
Patient-facing material from the largest ophthalmology professional body, covering conditions, tests and treatments outside refractive surgery.
Used for Cross-checking patient-facing explanations of non-refractive eye conditions; Describing what tests such as dilation and OCT involve.
Link checked 23 September 2026