Evaluating the Tobii Pro Fusion-120Hz Eye Tracker for Clinical Use

Abstract

Background: This study aims to establish normative data for saccadic peak velocity using the Tobii Pro Fusion-120Hz, a lower sampling rate eye tracker. The data will be compared with the higher sampling rate, EyeLink 1000 Plus, which has already been validated for clinical use. Methods: Thirty participants (aged 20-23) with normal ocular motility and best-corrected visual acuity of 0.2 log MAR or better were recruited. Exclusion criteria included high myopia, ocular trauma, brain injuries, and the use of rigid gas-permeable contact lenses. Saccadic movements were measured using the Tobii Pro Fusion-120Hz eye tracker. Data were recorded and analysed using Tobii Pro Lab Software and SPSS version 23. Calibration accuracy and precision thresholds were set at 0.5° and 0.2°, respectively. Participants completed 24 saccadic trials tested binocularly, and the recorded peak velocity data was compared with data validated using the higher sampling rate devices (500Hz). Results: The one-sample t-test showed no significant difference in saccadic peak velocity (p = 0.40) between the lower sampling rate and the higher sampling rate, indicating that the former can produce saccadic peak velocity measures comparable to those of the latter. Conclusion: The study successfully establishes normative data for saccadic peak velocity using the Tobii Pro Fusion-120Hz. The results confirm the device's capability for accurate clinical assessment, demonstrating its reliability in measuring saccadic movements.