濾藍光鏡片之使用對長時間電腦工作者減輕視覺疲勞的效果

隨著科技持續汰舊換新，電腦、通訊、電子消費產品螢幕，已經從液晶顯示器 ( liquid crystal display，LCD ) 轉換成發光二極體 ( light emitting diode，LED )。由於LED的光源特性為發光面集中、光源具指向性，白光LED光源其頻譜有藍光峰值之特點，讓長時間觀看LED螢幕容易產生干擾視覺的眩光。研究目的欲探討，長期間使用LED電腦液晶螢幕進行閱讀作業時，濾光片鏡片之配戴是否對於視覺疲勞是否有顯著影響。方法: 本實驗招募20位年輕的自願者參與，在配戴0%、20%、50%與80%濾藍光鏡片四種條件下隨機試驗，於閱讀前、閱讀50分鐘和100分鐘後，運用閃光融合閾值、睫狀肌調節變化量、視覺疲勞主觀問卷、淚液破裂時間、淚液破裂時間、調節幅度、近點調節力等六種方式評估長時間閱讀後視覺疲勞的程度。結果顯示: 觀看電腦螢幕50分鐘及100分鐘後，發現時間越長，閃光融合閾值越小，視覺疲勞主觀問卷也隨著觀看電子螢幕時間有顯著增加，因而眼睛越疲勞。濾藍光片的使用對減少疲勞並沒有顯著性的差異。結論: 濾藍光鏡片對減輕疲勞沒有明顯的影響，避免長時間觀看電腦螢幕，並且在使用電腦時搭配適當休息，減輕眼睛疲勞感。

Through advancements in technology, 3C (computer, communication, consumer-electronics) products have been combined in our daily lives. 3C products’ monitors have now switched from Liquid Crystal Display (LCD) to Light-Emitting Diode (LED). From tablets, smart phones, video display terminals to LED TV, where we are in front of LED monitors all day long. The property of LED light is that they are concave, high directionality and the spectrum apparent peaked on the blue light area. The way Blue light causing damage to retina has been proven in research papers. Blue light in VDT (video display terminal) can also induce glare and eye fatigue. Purpose: There are rare papers discussed regarding whether or not assembling of blue light filtering lenses on spectacles can reduce glare, and/or reduce LED VDT fatigue. In this research we have recruited 20 young college or graduate students. Method: We asked them to operate LED VDT in four different conditions, wearing spectacle with, or without 3 kinds of different tinted blue-light-filtering lenses. By comparing the level of effect in reduced fatigue when they operate VDT. In this research project, we used six ways of measurements（NITBUT、CFF、HFC、VAS、NPA、AA）to compare the effect of reduced fatigue, under different kind of tinted blue-light-filtering lenses, at the moment of prolong operated VDT before the test, 50 minutes after the test, and 100 minutes after the test. Results: The longer time to operated VDT reducing the less CFF values and VAS values was increasing after testing 50 minutes and 100 minutes, that indicated eyestrain. Conclusion : Blue light filtering lenses on spectacles had less influenced to reduce fatigue, we should avoid prolong time operated VDT and always have proper rest to reducing fatigue.