Now Shipping! – The EyeLink 3; combined head and eye tracking at up to 1000 Hz.

SR Support Forum   ›   Learning Resources   ›   FAQs   ›   EyeLink Hardware FAQs   ›   FAQ: EyeLink II: what is the difference between the Pupil-CR and Pupil Only modes?
FAQ: EyeLink II: what is the difference between the Pupil-CR and Pupil Only modes?
Sam
Research Support Specialist
*******
Joined: Aug 2020
Posts: 943

#1
09-09-2020, 09:34 AM
The EyeLink II system allows gaze to be tracked in either Pupil-CR (Pupil - Corneal Reflection) or Pupil Only mode.
  • The Pupil-CR mode is less susceptible to drift than the Pupil Only mode, as the corneal reflection helps to correct for headband slippage.
  • However, the Pupil-CR mode only supports 250 Hz tracking, whereas the Pupil Only mode can track at up to 500 Hz.
For experiments in which the participant will be moving a lot (such as real-world navigation or kinesiology experiments), the Pupil-CR mode is recommended.