Hi, many thanks for your answer, Yes, our Tobii, is X60, I always export the data file as .tsv and import it by matlab to get the pupil diameter. Our stimuli are two iso-luminance faces on the two sides of the screen, and it’s important for me to know if there is a correction on the pupil diameter when the participant (infants in our experiments), look off the center, from one side to the other. Because this problem has been reported in Tobii and other eye trackers (trying to find the paper I was reading a while ago), but I didn’t do a comprehensive analysis for this purpose on my data yet.
Thanks again for your help!
Milad