| Summary: | 碩士 === 國立交通大學 === 光電科技學程 === 106 === Eyes are human’s main sense organ to receive information from outside world. The vision of the eyes receives roughly eighty percent of outside messages. In the era of high use of the eyes, excessive uses of the eyes become the main cause of visual fatigue. For instance, working in an improper external lighting environment would accelerate the degree of visual fatigue and consequently affect work efficiency. Nowadays, it is increasingly popular to take use of LED lighting in indoor environment. Compared to the traditional fluorescent technology, LED lamp possesses superior power and it has greater lifespan and electrical efficiency. The characteristic of lighting effect is complicated. Hence, new lighting technology’s impact upon contemporary people’s life and mental condition has become one of the issues in which deserved to pay attention to.
The experimental structure mimics general office field and working mode. White LED was used as experimental light source. The experimental conditions were bicolor temperature (400K / 6000K), two kinds of illuminance (400lux / 700lux), three peak wavelength of blue lights (420nm / 460nm / 480nm) respectively. The subjects are mainly youth workers, literally six men and six women, in total twelve people (average 23.67 ± 0.62).
Experimental tasks were reading, Go-No-Go and proofreading. During the full course of the experiment, physiological signal equip is utilized to record changes of physiological signals. Analyze experimental subjects’, heart rate variability (HRV) and blinking rates and critical flicker fusion threshold (CFF) through electroencephalogram (EEG), electrocardiogram (ECG) and electrooculography (EOG), Flicker Fusion System and other records. Couple with questionnaire of subjective visual fatigue to find out a white LED light source in which is able to reduce visual fatigue.
How to ensure a balance between the maintenance of high work productivity and reduction of visual fatigue is our research target. This research finding are that low color temperature, low illuminance and white LED with 460nm peak wavelength of blue light light source indeed ensure low degree of visual fatigue, which is the main option to reduce visual fatigue.
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