Visual display terminal (VDT) tasks typically require vision and memory, resulting in a heavy workload. Effective information presentation in augmented reality environments to reduce workload is a worthwhile research direction. As a fundamental attribute of information presentation, visual information orientation significantly impacts users' perception and processing of task information; however, there is limited research on the visual information orientation of 3D user interfaces in augmented reality HMDs. In order to fill this gap and further deepen the design principles of user interfaces in AR environments, we focused on VDT tasks in AR. We investigated the impact of visual information orientation of user interfaces on task performance in anchored mode. This study quantifies visual information orientation in terms of angles and designs three 3D interfaces with distinct visual information orientations. We extracted three information modules from the typical VDT task to design a continuum visual task and evaluated users' task performance in these interfaces in a controlled experiment. We find that a visual information orientation angle close to 180 degrees improves the user experience and significantly impacts the user's visual perception range. This paper demonstrates the potential of various information orientations for VDT tasks and offers insights for interface design in augmented reality environments.