Troubleshooting eye tracking

If the recording of eye movements with the eye tracker does not work, an error message is displayed. Calibration cannot be completed successfully if there are problems. Possible solutions are:

Eye tracking and webcam

  • Make sure that you have only connected one monitor. It may happen that the system assumes the eye tracker or webcam is attached to the other monitor.
  • Select your correct screen resolution when creating a study. If the selected screen resolution is greater than that of the monitor used, the study cannot be performed on that monitor.
  • If the calibration is stuck, restart the tester software.

Tobii eye trackers

  • Perform a calibration with the Tobii software.
  • If you have a tobii EyeX eye tracker make sure to connect it to a USB 3 port.
  • Make sure that you maintain a suitable distance from the monitor during study participation (45 – 100 cm). In the study, a message is displayed if the subject is outside the recording range of the eye tracker.
  • If the eye tracker was not found in the tester software, check that you have downloaded the correct Tobii software.

Why is my eye-tracking data so inaccurate with the webcam?

Webcam eye tracking won’t be able to show the precise location of your user’s gaze, it will rather give you an overview of an area that was focused. The longer the recording, the less accurate the data will be.

Regardless, please keep these tips in mind:

  • Front-facing lighting.
    Make sure that the light source is bright enough to illuminate your face and coming from in front of you. Avoid harsh shadows.
  • Try not to wear glasses.
    Glasses often reflect the light back and are generally harder to see through which can make it difficult to detect your eyes.
  • Keep your head straight.
    Try to keep your head centered and movement minimal. This makes it easier to calculate the position of your pupils.

If you are looking for a more detailed eye tracking experience, then infrared eye tracking is the correct choice as it replicates the exact movement of every user’s gaze. Especially when conducting research on user behavior in a lab environment.