眼睛為人類接收外界資訊主要的感官，約有80%的外界訊息需靠雙眼的視覺來獲取。在知識與資訊發達的21世紀，多數人常處於VDT(visual display terminal)之作業方式下工作長達5小時，因此眼睛需要長時間盯著螢幕，如果再加上不當的外在照明環境，更會增加眼睛的疲勞度進而影響工作效率。而在追求健康舒適的室內環境品質同時，如何落實地球永續節能，也已成為大家關注之重要課題。因此本研究在節能減碳之利基下以LED燈源，探討不同照明方式下對工作效率影響之研究，透過綜合分析主觀心理評價、客觀生理感受量測與工作效率表現，提出具節能、健康舒適的VDT作業光環境模組，作為使用者與設計者日後之參考應用。

研究方法：
本研究係以足尺實驗室作為環境感知實驗場所，於實驗室中以眼球追蹤系統結合VTS(Psycho Diagnostics with the Vienna Test System, VTS)電腦檢定測驗和受測者心理評價問卷，進一步分析在不同照明方式下眼球運動，同時參考生理反應如眨眼次數、閉眼時間，探討在視覺終端處理(VDT)的作業中，不同照明方式下對工作效率影響，藉由整合心理主觀感受評價、生理反應量測與工作效率變化，提出較佳之工作效率環境模組建議。

研究結果：
在300lx與500lx建議進行VDT作業的室內光環境中，降低環境照度，增加局部照明以維持作業面照度，對工作效率影響不大，以此混合照明方式替代全般照明來節約能源是具可行性，且在長時間下對工作效率具提升之效果，但也容易造成視覺疲勞。若對視覺需要要求較高者應優先考量全般500lx模組，可提供較穩定之工作環境，且在生理視覺疲勞中有較好的表現，改變任務工作負荷時心理感受具正面提升效果。綜合結果混合照明適合需花費腦力之作業，而全般照明適合用於視覺專注力高的作業。

Eyes are the main sensor to receive information from the outside world as around 80% external messages are captured by vision. In the informative 21st century, most people work up 5 hours under VDT with their sights fixed on the screen. Furthermore, inappropriate outer lighting environment fatigues workers' eyes, thus lower their productivity. In the meantime, while pursuing a healthy and comfortable interior quality, sustainable use of energy has also become a main issues in public. In conclusion, this research studies the influences to productivity by using different lighting methods based on LED lights under energy-saving and carbon reduction principle. Through the analysis of subjective psychological evaluation and subjective measurement of physical senses to productivity, this research proposes an energy-saving, healthy and comfortable VDT task lighting environmental module for the use and reference of users and designers.

Research Methods
A full-scale laboratory is utilized for the experiment of environmental senses in this research. In the laboratory, eye tracking system is utilized with VTS (Psycho Diagnostics with the Vienna Test System, VTS) computer test and questionnaires to evaluate testee's phychological condition to further analyse eye ball movement under different lightings. In the same time, physical reactions such as blink of eyes and the time of eye-closing are referred. This research investigates how productivity are affected under different lighting modes in VDT works by integrating the phychological subjective senses evaluation, measurement of physical recations to measure changes in productivity, so as to propose a recommendation on envirmental module for higher productivity.

Research Result
In the recommended 3001x and 5001x interior lighting enviroment of VDT work, productivity are not greatly affected by reducing environmental lighting or increasing partial lighting. Mix of those two lightings are feasible to replace a full lighting to save energy and increases productivity in long hours, but is likely to cause visual fatigue. If visual demands are higher, a full 5001x module should be considered with priority to provide a stabler work environment. Moreover, this module performs better in physical visual fatigue and affects psychological feelings in positive way when workload of task is changed. In sum, mixed lighting is suitable for mental task, and full lighting is suitable for high visual concentration task.

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