Hi @beankong, thanks for getting in touch. Unfortunately, we do not have a dedicated research report on the accuracy of the Tobii Eye Tracker 5 however, there was a study conducted recently using the older EyeX tracker which has comparable (although inferior) accuracy and precision to the ET5 which never the less demonstrates the efficacy of the technology for research and analysis which should hopefully be adequate to demonstrate it’s use for gaming also.
You can view the report @ https://www.researchgate.net/publication/305213481_Evaluation_of_the_Tobii_EyeX_Eye_tracking_controller_and_Matlab_toolkit_for_research
Please check it out and do let us know if we can provide any further information. Best Wishes.