鑒於3D環境之裝置例如AR、VR等科技日漸普及，但目前仍無一致性的設計原則，本研究回顧目前立體實境之相關研究,探討三個影響因素包含顯示環境之設計、互動原則之設計及任務困難度等對使用者績效之影響，並利用系統操作最常見之水平選單進行實驗。
顯示環境主要利用人眼知覺 3D 影像之單眼及雙眼線索進行設計，而其中影響立體視覺最主要來自單眼影像之視覺影像融合，本研究利用負像差之原理將選單呈現在3D電視螢幕及人眼之間。互動方式則仿擴增實境常使用之手勢追蹤輸入方法，利用Leap手勢追蹤裝置監測食指指尖之座標及移動方向，模擬真實環境按壓按鈕的情境；任務困難度由改變按鈕尺寸及距離進行調整。
其結果顯示，影響使用者最主要的因素來自於選單按鈕之尺寸及按鈕間距離，隨著按鈕尺寸越大及按鈕間距離越短，移動時間會隨之降低，而有游標輔助的客觀距離量測可以有效降低錯誤率，由於人眼在立體實境下會有距離預測落差，因此在微幅負視差的條件表現相對較好，但未達顯著影響。另外，按鈕位置亦會影響使用者績效，目視中心的按鈕錯誤率最低。本研究之結果將可應用至立體實境近體空間之選單設計。

In view of the 3D technologies such as AR and VR getting popular, but there are still no consistent design principles, thus this study reviews the current research in stereoscopic reality and sorts out several factors: the design of display, interaction and the difficulties of task.Menus are important in system operation, and often be operated via pointing. Since gesture tracking as input method commonly found in the augmented reality, here we used the Leap Motion to track user’s hands and fingers to operate the system, try to simulate how users press the button in the real environment.
This study controls the display environment, interaction mode, and the level of task difficulty to understand users’ performance. People use the monocular and binocular cues to detect the 3D images, but for the stereoscopic images are formed by the visual fusion from each eye. Here we compare negative parallax and zero parallax which belong to different display environments, and with cursors or without cursors in different interaction mode and different task difficulty.
The results show that the most important factor affecting the performance comes from the size of the menu button and the distance between the buttons. As the button size is larger and the distance between the buttons is shorter, the movement time will decrease, and the error rate will decrease, too. In cursor-assisted condition, user can measure the distance effectively, so the error rate reduced. And since the human will percept the distance incorrectly, the condition of smaller negative parallax is better. In addition, the button position affects user performance, for the center button, it has the lowest error rate. The results can be applied to design the stereoscopic menu in peripersonal space.

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