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FAQ: Should I track binocularly or monocularly?
#1
For most research scenarios, monocular (tracking one eye) is all you need. In other words, if you are mainly interested in recording gaze position, you only need to collect data from one eye (as in healthy participants the other eye will be looking at the same location on the screen). As most people are right eye dominant, tracking the right eye is most common. If you have issues getting good calibration / validation results with the right eye, you can try switching to the left eye.

When to Use Binocular Tracking
You should track binocularly (both eyes) only if your research specifically requires it. This is typically for studies involving:
  • Vergence or Ocular Disparity: Measuring how the eyes converge or differ in their view.
  • Microsaccades: Many algorithms used to detect these tiny, involuntary eye movements are optimized for binocular data.
  • Clinical populations (e.g. patients with nystagmus): Differences between the two eyes may be informative.