Visual Field Tracker | Home

When we think about eyesight, we usually think about visual acuity: how clearly we can read, recognize a face or see fine details.

But that's only one part of our vision. The visual field is everything we can perceive around ourselves, while looking at a fixed point.

Imagine for example right now, reading here this article. While your eyes are going word by word, you know that your hands are on the desk; if you are using a laptop you somehow see its keyboard. Indeed you also might see a person approaching you from a side: you are not looking at the side but you perceive the context around you anyway.

That's the Visual Field. It's an area horizontally large about 200-210 degrees and vertically 100 to 135 degrees.

Changes in the visual field can occur for different reasons and can sometimes be surprisingly difficult to notice. When they develop gradually, our brain compensates and may adapt to missing information, making a loss of vision much less obvious to perceive in everyday life.

This is one reason visual-field testing is used in eye care: it can identify areas where visual sensitivity is reduced or absent, even when the person may not consciously perceive the change.

Visual Field Tracker was built to let people record where they perceive a moving stimulus and compare those self-recorded maps over time. It cannot determine whether vision or a medical condition has changed.

Visual Field Tracker provides a guided way to record where you perceive a moving visual stimulus on your own screen.

You do that at home, online, using your own computer. You can export a personal PDF summary and create an Illustrative Vision Simulation that you can share with your relatives, your friends and your doctor.

Note: These outputs are experimental and are NOT medical reports

The process is built around three points:

Record

Follow the guided procedure while keeping your eyes focused on a central reference point. Visual Field Tracker lets you explore different areas of your visual field and lets you record where the stimulus can and cannot be perceived.

In Visual Field Tracker, you deliberately control the stimulus and record the positions where you report that it disappears or reappears

Save and compare

Your recording map can be saved and compared with maps from later sessions.

The comparison displays differences between user-recorded points. Those differences may result from the setup, attention, technique or perception and cannot establish that vision or a medical condition has changed.

Simulate

Vision Simulation applies an illustrative effect to a photograph using the points you recorded. It may help communicate the recorded pattern, but it does not reproduce how you actually see.

Repeating sessions under similar conditions can create a personal history of your recorded maps.

Visual Field Tracker can display differences between sessions and help you inspect whether recorded patterns repeat.

It cannot determine whether your vision is stable or worsening. Differences may be caused by the device, environment, fixation, fatigue, attention or technique.

A Visual Field Tracker map displays the points recorded during an experimental session. It tells a lot to doctors but probably much less about how you feel when your vision is not as good as it used to be.

Letting a friend, your partner or family member, understands what visual-field loss could actually mean in your everyday life is another story.

That's why Visual Field Tracker can generate a Visual Field Simulation.

You can upload your own image, and overlapping it with a result of the Visual Field test already performed, you can create an illustrative effect based on the points recorded in that session.

Vision Simulation turns the recorded pattern into an image that may be easier to discuss.

A face, a person walking along a street, an object on a table or part of the surrounding environment may suddenly become difficult to perceive.

Visual Field Tracker's Vision Simulation was created to help bridge that gap — turning an abstract visual-field map result into something that can be more easily understood and shared.

Vision Simulation is an interpretation based on user-recorded points. It is not evidence of visual-field loss and cannot reproduce a person's subjective visual experience.