Pupil/eye shine issues

Threshold mis-adjustment and solutions

If the participant’s face appears cyan or the pupil cannot be detected (because it is not entirely blue), these settings may be adjusted with:

• Up/down arrow keys

  • pupil detection

  • blue threshold

• +/- keys

  • eyeshine/corneal reflection

  • cyan threshold (+=less cyan)

Illustration of the cyan (corneal reflection) and blue (pupil) detection thresholds.

More information is available through this YouTube tutorial.