近年來隨著科技的發展，穿戴式裝置已日益普及，而頭戴式顯示器也在性能與體積上不斷的改良，以符合現代網路發展與娛樂需求的提升。本研究針對Google Glass此種單眼穿透式頭戴顯示器 (See-Through Head-Mounted Display) 為研究對象，目前此種頭戴式顯示器的使用者介面元件 (User Interface Elements) 之研究甚少，因此本研究選擇文字大小與文字亮度作為介面配置之討論，並針對不同使用情境作使用性探討。
本研究共徵募20位受試者，透過閱讀文章之完成時間與錯誤率來探討閱讀之績效，以系統易用性量表 (SUS) 及心智負荷量表 (NASA-TLX) 作為主觀量測，了解受試者於使用Google Glass閱讀文章時的主觀感受，並使用閃光融合閾值 (CFF) 與視覺疲勞量表評估受試者使用Google Glass閱讀文章後的視覺變化，最後，再與受試者進行整體感受之開放性訪談與喜好調查。
研究結果發現，女性在閱讀完成時間顯著優於男性；文字大小、文字亮度及使用情境顯著影響閱讀績效與主觀舒適度，在靜態情境下適合使用文字大小24 pt與文字亮度165之文字，在動態情境下適合使用大小32 pt與亮度210之文字，在綜合評估後發現使用Google Glass閱讀文章時，文字大小需超過24 pt，並以32 pt為最佳，且亮度需超過165，並以210為最佳。使用情境也對於CFF值、視覺疲勞量表、SUS與NASA-TLX有顯著影響，結果顯示若受試者於靜態時使用Google Glass閱讀文章，其視力疲勞、使用性與心智負荷皆優於動態情境，且動態情境容易造成受試者產生暈眩感。本研究結果可提供開發者於介面設計時之參考指南。

Wearable device has been becoming popular over the past few years. With the fast development of the computer network technology, the functions and performance of head mounted displays are constantly making progress. There are few researches addressing the issues of user interface design of head mounted display.
This study considered the font size and font lightness of Google Glass to determine the best setting of user interface elements in see-through head-mounted display and investigate the usability in different application situations.
In here, the reading completion time, error rate, and the subjective measures including SUS and NASA-TLX were collected. Then, the critical fusion frequency value and eye fatigue scale were collected to evaluate the differences of visual fatigue after reading articles using Google Glass. Lastly, the users are invited to assess the overall feelings and preference through interview.
The results indicated that the completion time of women was better than men. The font size, font lightness and reading situation showed significant effects on reading performance and subjective comfort level. In static situation, the best font size was 24 pt and the best font lightness was 165. In dynamic situation, the best font size was 32 pt and the best font lightness was 210. From the overall evaluation, the study observed that the font size must be greater than 24 pt, 32 pt was the best font size and font lightness must be brighter than 165, and 210 was the best. In addition, the results also indicated when users are reading on Google Glass at a static situation, the measures in eye fatigue, usability and mental workload were better than those in a dynamic reading situation. The results of this study can provide very important reference information for interface design of Google glass related products.

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