In the video clip below we illustrate how to set up Tobii eye tracking glasses prior to a recording session. The software needs to be calibrated before each participant can be eye tracked, a process that takes around 1 minute to complete. The accuracy of calibration is dependent upon a number of factors which (from our experience) included:
- The shape of the participant’s face – fuller faced individuals with smaller eyes appeared to be harder to calibrate
- Blue eyes were notably easier to calibrate than dark eyes
In addition, participants did need to be encouraged to look directly through the glasses to improve the percentage of time that eye movement was recorded (for AoI analyses Tobii recommend greater than 40%). Our records ranged from 15% to 79%, which meant that some data was excluded from AoI analyses. In the dynamic situations we were working in, participants were often working up close with a patient, reading an ECG or making notes. This caused them to drop their eyes and look under the glasses with loss of eye tracking.
