Objective:The positioning of the external camera in current designs of retinal prostheses may affect the egocentric spatial frame of reference and lead to pointing and localisation errors. The present simulated prosthetic vision (SPV) study investigated the immediate effects of four camera positions: (i) centre-mounted (CM), (ii) head-mounted (HM), (iii) left-mounted (LM), (iv) right-mounted (RM) on egocentric localisation. Approach:Fifteen sighted participants performed a pointing task while viewing the stimulus through a simulation of Bionic Vision Technologies’ 44-channel retinal prosthesis. Pointing responses were recorded immediately after exposure to different camera positions and prior to adaptation. The direction and magnitude of pointing errors and associated head movement behaviour were analysed using linear mixed effects analysis. Main results:Our results showed lower errors for medial camera positions (CM and HM) and overall improved accuracy and precision for CM position. Head orientation was found to largely influence the direction of pointing. There was a high positive correlation between direction of head orientation and direction of pointing with CM and HM camera positions, suggesting medial camera positions facilitated intuitive head orientation cues that are important for reliable egocentric direction estimation. Significance:The empirical evidence derived from the present SPV study offers practical guidance to reduce the effect on spatial dissociation of camera position in localisation tasks and inform design of future prosthetic vision devices and improve rehabilitation approaches.

目的：在当前的视网膜假体设计中，外部摄像头的位置可能会影响以自我为中心的空间参考框架，并导致指向和定位错误。当前的模拟假肢视觉（SPV）研究调查了四个摄像头位置的即时影响：（i）中央安装（CM），（ii）头戴式（HM），（iii）左装（LM），（iv ）右上角（RM）以自我为中心的本地化。方法：15名有视力的参与者通过模拟Bionic Vision Technologies的44通道视网膜假体来观察刺激，同时执行了指示性任务。在暴露于不同的相机位置之后和适应之前，立即记录指向响应。使用线性混合效应分析来分析指向错误的方向和大小以及相关的头部移动行为。主要结果：我们的结果表明，内侧摄像机位置（CM和HM）的误差较小，并且CM位置总体上提高了准确性和精度。发现头部方向在很大程度上影响指向的方向。头部定向的方向与使用CM和HM摄像头位置的指向方向之间存在高度正相关，这表明内侧摄像头位置有助于直观的头部定向提示，这对于可靠的自我中心方向估计很重要。启示：从目前的SPV研究中获得的经验证据为减少定位任务中摄像机位置的空间分离的影响提供了实际指导，并为未来的假肢视觉设备的设计提供了信息，并改善了康复方法。