Eye-tracking - Setting physical screen size and distance to participant
In PyGaze, the physical display size in centimeters is given by the variable
SCREENSIZE = (31.0, 17.4)) and the distance from the participant to the display, also in centimeters, is given by
SCREENDIST = 60.0).
I don't know exactly how relevant these variables are but, as far as I could determine, there is no direct way to configure their values using PyGaze's OpenSesame plugins.
I assume they can be set using an inline script but I haven't looked into that yet.
At the top of the eye-tracking output files (I'm using a Tobii eye-tracker), in the initiation and calibration reports, I have the information "display size in cm: 33.8x27.1" and "distance between participant and display: 57.0 cm".
I don't know if these values are being calculated somehow; it seems to me that these are just the default values; but their are not correct (my current display size is about 31.0x17.4 cm and the distance should be between 60 and 65 cm.
Are these variables relevant?
Should I set them to the correct values using an inline script and, if so, how should I go about it?
My thanks in advance!