Generating pupil size (mm) values using pixel data and corneal reflex data
I have been having an issue with my SMI RED-m device. Occasionally and seemingly at random, all "mapped pupil diameter" (mm) data is missing from the .idf files for a given condition. I am trying to figure out what is going wrong (I posted on here a few weeks ago) but failing that -- I am wondering if anyone is aware of a way to convert to mm diameter data using the pixel data and the corneal reflex data...
If I were to use a headrest for my experiment, and then to place a dummy head with a pupil (black circle of which I know the diameter) on the headrest in front of the RED-m, I might then be able to calculate a conversion value (how many mm is one pixel)...
But I am wondering if corneal reflex data could be used instead of this (potentially crude?) method?
Any advice is greatly appreciated, and please check my last post if you would like more information on the missing data issue.
Thanks in advance!