光場AR眼鏡與傳統AR眼鏡在使用者效能與經驗的比較

Abstract

現今多數的擴增實境 (AR) 的穿戴型顯示器只有一個固定的焦平面，因此使用者容易受到視覺輻輳調節衝突 (VAC) 的影響。相對地，光場顯示器的使用者不會受到VAC影響，能夠在使用顯示器時對焦在任何的深度上。本篇論文提出了系統性的定量實驗方法，比較近眼的光場AR顯示器與傳統AR顯示器在使用者效能與使用者體驗的差異。受測者在實驗中使用兩種AR眼鏡（光場AR眼鏡與傳統AR眼鏡）在兩種不同的距離（30公分與60公分）與模式（完全虛擬與虛實融合）下做一系列的文字型視覺搜尋任務。實驗結果表明：在虛實融合的模式、30公分的觀看距離下，與傳統AR眼鏡相比，受測者使用光場AR眼鏡的反應速度較快、正確率也較高。另外，從受測者的回饋得知：受測者在使用光場AR眼鏡時，能夠將虛擬與實際的資訊融合得比使用傳統AR眼鏡時更好。並且，光場AR眼鏡的使用者效能與受測者的觀看體驗並不會隨著觀看距離改變。儘管在兩種模式、60公分的觀看距離下，傳統AR眼鏡都獲得了比光場AR眼鏡高的搜索效率跟較快的反應速度，傳統AR眼鏡同時也收到了比光場AR眼鏡更多的負面回饋。總體而言，本研究點出了光場AR眼鏡在擴增實境應用中的優勢。

Most existing wearable displays for augmented reality (AR) have only one fixed focal plane and hence can easily suffer from vergence-accommodation conflict (VAC). In contrast, light field displays allow users to focus at any depth free of VAC. This research presents a series of serial text-based visual search tasks to systematically and quantitatively compare a near-eye light field AR display with a conventional AR display in user performance and user experience. We let all participants complete the tasks with two types of AR glasses: a pair of light field AR glasses and a pair of conventional AR glasses, at two different viewing distances: 30 cm and 60 cm, in two different environments: complete virtual (VR mode) and virtual-real integrated (AR mode) environments. The results show that the light field AR glasses lead to a significantly faster reaction speed and higher accuracy than the conventional AR glasses at 30 cm during the AR mode. Additionally, the participants’ feedback shows that the light field AR glasses better integrate the real and virtual information than the conventional AR glasses. Besides, user performance and experience of the light field AR glasses do not vary with the viewing distance. Although the conventional AR glasses lead to better user performance in search efficiency and reaction speed than the light field AR glasses at 60 cm during both the AR and VR modes, much more negative feedback was received during the use of the conventional AR glasses. To conclude, this research highlights the strength of light field AR glasses for AR applications.