LED照明环境下照明参数对人眼视疲劳的影响

通过析因实验,测量被试者在不同色温和照度组合的照明环境下进行不同时长学习的眼电信号,分析其眨眼频次和闭眼时间变化率,从而判断视疲劳程度的变化。结果表明:照度、色温、光照时间、色温和照度的交互作用对眨眼频次和闭眼时间的变化率具有显著性影响,其中,色温和照度的交互作用影响力最大;视疲劳随着照度的提高,总体呈现先降低后上升的趋势,照度的最优水平为1 000~2 000lx,超过3 000lx的高照度应避免;4 000K色温条件下,眨眼频次和闭眼时间的变化率均较小,视疲劳相对较低;随着光照时间的增加,眨眼频次和闭眼时间变化率均变大,视疲劳加重;光照时间最佳为0.5~1h,且不宜超过1.5h。

Effects on visual fatigue of the human eyes of lighting parameters under LED luminous environment

By factorial experiment, the frequency of blink and rate of time of closed eyes of the measuring subjects are analyzed to judge the degree of visual fatigue when they are in different time learning with the eyes of the electrical signal under the lighting environment of a combination of different color temperature and different shades of light. The results showed that:the interaction effects of illumination, color temperature, illumination time and light intensity have significant influence on frequency of blink and the rate of change in closed eye time. Among them, the color temperature and illumination has the greatest interaction effects. With the increasing of illumination, visual fatigue decreases firstly and then rises. The optimal level of illumination is 1 000~2 000 lx, and the high illumination of over 3 000 lx should be avoided. Under the condition of 4 000 k color temperature, the blink frequency and the rate of closed eyes time are both less and the visual fatigue is relatively low. With the increase of the time of illumination, the rate of blink frequency and the time of closed eyes increase and the visual fatigue aggravates. The optimum illumination time is 0.5~1 h and should not exceed 1.5 h.