A number of virtual reality head-mounted displays (HMDs) with integrated eye trackers have recently become commercially available. If their eye tracking latency is low and reliable enough for gaze-contingent rendering, this may open up many interesting opportunities for researchers. We measured eye tracking latencies for the Fove-0, the Varjo VR-1, and the High Tech Computer Corporation (HTC) Vive Pro Eye using simultaneous electrooculography measurements. We determined the time from the occurrence of an eye position change to its availability as a data sample from the eye tracker (delay) and the time from an eye position change to the earliest possible change of the display content (latency). For each test and each device, participants performed 60 saccades between two targets 20° of visual angle apart. The targets were continuously visible in the HMD, and the saccades were instructed by an auditory cue. Data collection and eye tracking calibration were done using the recommended scripts for each device in Unity3D. The Vive Pro Eye was recorded twice, once using the SteamVR SDK and once using the Tobii XR SDK. Our results show clear differences between the HMDs. Delays ranged from 15 ms to 52 ms, and the latencies ranged from 45 ms to 81 ms. The Fove-0 appears to be the fastest device and best suited for gaze-contingent rendering.

许多带有集成眼动追踪器的虚拟现实头戴式显示器 (HMD) 最近已投入商用。如果他们的眼动追踪延迟足够低且足够可靠，可以进行注视相关渲染，那么这可能会为研究人员带来许多有趣的机会。我们使用同步眼电图测量来测量 Fove-0、Varjo VR-1 和 High Tech Computer Corporation (HTC) Vive Pro Eye 的眼动追踪延迟。我们确定了从眼睛位置发生变化到其可用作眼动仪数据样本的时间（延迟）以及从眼睛位置变化到显示内容最早可能发生变化的时间（延迟）。对于每次测试和每台设备，参与者在视角相距 20° 的两个目标之间进行 60 次眼跳。目标在 HMD 中持续可见，并且眼跳由听觉提示指示。使用 Unity3D 中每个设备的推荐脚本完成数据收集和眼动追踪校准。 Vive Pro Eye 录制了两次，一次使用 SteamVR SDK，一次使用 Tobii XR SDK。我们的结果显示了 HMD 之间的明显差异。延迟范围为 15 毫秒至 52 毫秒，延迟范围为 45 毫秒至 81 毫秒。 Fove-0 似乎是最快的设备，最适合注视相关渲染。