用瞬目频率评价液晶电视机的偏振光特性对视疲劳的影响  

Influence of polarization characteristics of liquid crystal display television on visual fatigue

作　　者：龙时先[1] 吴德正[1] 付东[2] 梁炯基[1] 文峰[1] 黄时洲[1] 朱昌昌[2] 闫晓林[2] 

机构地区：[1]中山大学中山眼科中心中山大学眼科学国家重点实验室,广州510060 [2]TCL集团工业研究院,深圳

出　　处：《眼科研究》2008年第5期380-383,共4页Chinese Ophthalmic Research

摘　　要：目的比较液晶电视射出的线偏振光和圆偏振光对视疲劳的影响程度。方法64例正常人随机分为两组,每组32例,分别观看出射光为线偏振光或圆偏振光的液晶电视机播放的故事片125min。用眼电图(EOG)记录观看故事片前后及观看故事片过程中的瞬目频率,分析比较瞬目频率的变化特性。结果线偏振光组观看故事片后的瞬目频率比观看前高,差异有统计学意义(P<0.01);圆偏振光组观看故事片前后的瞬目频率差异无统计学意义(P>0.05)。结论长时间观看出射光为线偏振光的液晶电视机较出射光为圆偏振光时易引起视疲劳。Objective To record the blink rates while watching liquid crystal display television （LCD TV） continuously for a long time and compare the difference of the influence of two polarization conditions,linearly polarized and circularly polarized, of the display light from the LCD TV,on visual fatigue. Methods Sixty-four normal individuals were divided randomly into 2 groups at average. All of the subjects watched a movie on LCD TV for 125 minutes. The display light of the LCD TV was linearly polarized for one group （linearly polarized group） and circularly polarized for another group （ circularly polarized group）. The blink rates of eye before, during and after watching the movie were recorded by electrooculargram. The differences of blink rates in different conditions and different time were analyzed and compared. Results There were significant differences in blink rates in both two groups with time lapse （ F = 6. 574,P = 0. 001 ; F = 3. 374, P = 0. 023 ）. In linearly polarized group, the mean blink rate was evidently increased at 120 - minute watching and after watching movie compared with before watching （P 〈 0. 05 ,P 〈 0.01 ）. No significant difference was found in blink rates between before and after watching the movie in circularly polarized group （P 〉 0.05 ）. A statistically significant difference was seen in the difference value of before and after watching between linearly polarized group and circularly polarized group（ t = 2.59,P 〈 0.05 ）. Conclusion The visual fatigue is more easily induced by watching a LCD TV displayed with linearly polarized light for a long time than that with circularly polarized light.

关 键 词：瞬目频率 视疲劳 眼电图 液晶电视 偏振光 

分 类 号：R77[医药卫生—眼科]