Visual Field Test Online: Glaucoma Monitoring at Home

What is a visual field test?

A visual field test (also known as perimetry) measures how far and how clearly you can see to the sides, above and below when you are looking straight ahead.

It is most commonly used to assess peripheral vision in each eye for conditions such as glaucoma. By testing many points around your central vision, the test builds a map of how sensitive your vision is across your field of view.

Why visual field testing matters

Glaucoma is a leading cause of irreversible blindness worldwide. Yet when it is detected early, further vision loss can often be prevented.

Visual field testing helps eye care clinicians:

Detect glaucoma at an earlier stage
Monitor how the condition changes over time
Assess how well treatment is working

Because glaucoma damage can be subtle at first, regular, high-quality visual field testing is an important part of protecting sight.

How Eyeonic’s online test works

Eyeonic turns a standard computer or tablet into a sophisticated visual field testing device:

Step One

One eye at a time

You are asked to cover one eye and keep your gaze on a central target.

Step Two

Light spots appear in your side vision

Small light stimuli are shown at different points of your peripheral vision. Some are easier to see, others are dimmer – this helps determine the faintest spots you can detect.

Step Three

A detailed map is created

The test usually focuses on the central 24 degrees of your vision, using dozens of test locations. From your responses, a map of your visual field is generated for each eye.

Step Four

Automatic comparison with normal values

Your sensitivity at each point is compared with age-matched normal data. Areas that are reduced are flagged as potential visual field defects for your clinician to interpret.

Throughout the test, Eyeonic uses your device’s camera to monitor head position and gaze. If you move too far, too close, or away from the fixation target, the test pauses and on-screen and verbal instructions guide you back into the correct position before continuing.

What the results show

Your report includes:

Sensitivity maps: showing how sensitive your vision is at each point tested
Deviation maps: highlighting where your results differ from normal values
Pattern analysis: helping to distinguish overall blur (e.g. cataract) from localised defects

Summary scores, including the Visual Field Index (VFI), which gives an easy-to-understand percentage score of your overall visual field (100% is normal)

These details are designed for clinicians, but the key message is simple: the test provides a clear picture of how well your peripheral vision is functioning.

Normal or abnormal: what does it mean?

A normal visual field is reassuring, but it does not guarantee that the eyes are completely healthy. In early glaucoma, visual field tests may still appear normal, which is why they must be interpreted alongside a full eye examination and other tests.

An abnormal visual field does not automatically mean you have glaucoma. There are many possible causes, and sometimes a test result can be affected by tiredness, loss of concentration, or incorrect technique. Your eye care professional will review the results, repeat the test if needed, and explain what they mean for you.

Visual field testing is always complementary to clinical care, not a replacement for it.

How often should testing be done?

Your eye care clinician will tailor a schedule for you, but as a guide:

Many people with glaucoma are advised to have around six tests in the first two years, then every six months thereafter.
Higher-risk patients may need testing more often (for example, every 3–4 months).
People at risk of glaucoma, but without a diagnosis, are often tested every 6–12 months.
Eyeonic’s ability to run on any compatible computer or tablet makes it easier to achieve the recommended frequency, supporting better long-term monitoring.

Test reliability

Visual field testing is a subjective test. It relies on people pressing the button when they see a light. That naturally introduces some room for error.

Eyeonic helps manage this by tracking:

False positives: pressing when no light is shown
False negatives: missing lights that should be easy to see
Fixation losses: looking away from the central target

If these are too high, the report will note low test reliability. Otherwise, you and your clinician can be confident that the result is of high quality.

Cybersecurity and data protection

Eyeonic places cybersecurity and privacy at the heart of its platform:

Built with support from Microsoft and hosted in the secure Azure cloud environment
Encryption of data in transit and at rest
Strong authentication, including robust password policies and optional two-factor authentication
Identity checks for clinicians and fine-grained control over who can access patient data
Secure development practices, private code repositories, and ongoing security monitoring
By embedding security into every layer of the system, Eyeonic delivers a safe, compliant environment for visual field testing on any computer or tablet.

Always in partnership with your eye care clinician

Eyeonic is designed to extend, not replace, professional eye care.

Your tests are most useful when interpreted by an optometrist or ophthalmologist who knows your eyes, your risk factors, and your treatment plan.

Visual field testing from any computer or tablet is about making high-quality glaucoma monitoring more convenient and accessible while keeping clinical expertise at the centre of every decision.