Glaucoma
Typical arc-shaped or nasal defects can be identified and monitored for progression.
Assessing vision beyond the point of fixation
Perimetry and visual field measurement
Perimetry measures how different parts of your visual field respond to light. It can reveal functional losses that remain unnoticed in daily life for a long time.
Understanding the procedure
Look straight ahead while the device tests your surrounding vision.
With one eye covered, you focus on a central point. Lights of varying brightness appear at different positions; press the button when you see one.
Your responses create a map of visual sensitivity. Reliability measures show whether fixation, responses and concentration allow us to interpret the results confidently.
- Measurement
- Sensitivity to light in the visual field
- Cooperation
- Keeping your gaze steady and responding to lights
- Duration
- Depending on the test program
- When it is used
- Glaucoma, retina, neurology, expert reports
Used where needed
What can a visual field test tell us?
The test area and strategy are chosen according to the suspected condition.
Neurological disorders
Patterns of visual field loss may point to the visual pathway, optic nerve or particular areas of the brain and guide further tests.
Retina and optic nerve
Inflammation, vascular occlusions and other damage can cause local losses of visual function.
Medical assessments
We check the required visual field limits and functions for the relevant legal assessment.
Step by step
This enables reliable measurement.
The test requires concentration. Breaks and repeat testing are normal.
Using the appropriate correction
A suitable corrective lens is used for the test distance if needed, with one eye covered.
Look at the central point
Keep looking at the central point; do not move your eyes towards the flashes.
Confirm stimuli
Press only when you see a light. Very faint flashes and periods without a stimulus are part of the test.
Evaluate quality
We check fixation losses, false positive and negative responses and patterns, repeating the test if needed.
Understanding the results
An initial visual field test often needs confirmation.
Tiredness, learning effects, dry eyes and unsuitable correction can create apparent defects. We therefore check new findings for consistency and reproducibility.
Glaucoma monitoring involves more than the grey map. Trend and event analyses compare several tests to distinguish true deterioration from normal variation.
Well prepared
How to prepare for your visit
- Come well rested, if possible
- Bring your current glasses
- Before starting, agree with the team how to handle blinking and breaks
- If you are unsure, avoid guessing
Frequently asked questions
Clear, concise answers.
Why are some light points so weak?
The device finds the faintest light you can detect at many points. Some flashes therefore need to be very dim or may not be shown.
May I blink?
Yes. Blinking regularly keeps the eye’s surface clear. Please tell us if you need a break.
Why does the measurement have to be repeated?
Learning effects and normal variation are common. Reproducible findings and follow-up are needed for confident interpretation.
Medical note
This page cannot replace an eye examination. Your symptoms, history and findings determine which tests are useful and how their results should be interpreted.
Medical basics
Sources and further information.
Related topics
All non-surgical eye care services