Hey PupilLabs team, i have a question. I'm currently using both the pupil Core and pupil AR/VR devices to measure pupil dilation in various situations. However while comparing both results i seem to have encountered different kinds of precision or similar. Im not sure how this could happen since both devices uses the same software and cameras if im not mistaken... Is there any current research on the comparability of both devices?
Hi @user-f590a4. Pupil size estimates are dependent on a few factors that could lead to discrepancies between measurements and systems, e.g. 3d eye model fit. Read more about that here: https://docs.pupil-labs.com/core/best-practices/#pupillometry
yes i check that out before and i closely controlled the pupil detection. I used post-hoc detection as well on a few samples, for testing purposes. For both devices it worked fine, but i still getting differences in pupil estimation between the Core and AR/VR... Even on the same person with similar light conditions...
When you say 'similar' light conditions, just how similar are we talking? In VR HMDs, the displays can be quite bright indeed, and it might be expected that they elicit a different pupil size change when compared to gazing in the 'real world'
Ah i didnt know that it was shown that VR HMDs did elicit a different pupil size change? I thoug i could account for that by only comparing baseline corrected relative pupil dilation changes...?