Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2020.07.29.220889v1?rss=1 Authors: Sipatchin, A., Wahl, S., Rifai, K. Abstract: Background: Adding an eye tracker inside a head-mounted display (HMD) can offer a variety of novel functions in virtual reality (VR). Promising results point towards its usability as a flexible and interactive tool for low vision assessments and research of low vision functional impairment. Visual field (VF) perimetry performed using VR methodologies evidenced a correlation between the reliability of visual field testing in VR and the Humphrey test. The simulation of visual loss in VR is a powerful method used to investigate the impact and the adaptation to visual diseases. The present study presents a preliminary assessment of the HTC Vive Pro Eye for its potential use for these applications. Methods: We investigated data quality over a wide visual field and tested the effect of head motion. An objective direct end-to-end temporal precision test simulated two different scenarios: the appearance of a pupil inside the eye tracker and a shift in pupil position, known as artificial saccade generator. The technique is low-cost thanks to a Raspberry Pi system and automatic. Results: The target position on the screen and the head movement limit the HTC Vive Pro Eye's usability. All the simulated scenarios showed a system's latency of 58.1 milliseconds (ms). Conclusion: These results point towards limitations and improvements of the HTC Vive Pro Eye's status quo for visual loss simulation scenarios and visual perimetry testing. Copy rights belong to original authors. Visit the link for more info