不同环境照度下VDT影响视疲劳的实验研究

Experimental Study on the Effect of VDT on Visual Fatigue Under Different Environmental Illuminances

基于保护学生视力等方面的考虑,本文通过采用闪光融合频率、视觉行为绩效等多种疲劳检测方法相结合的方式,研究学生线上线下学习作业条件下,智能手机及投影仪在不同环境照度指标下对视觉绩效及视疲劳的影响。结果表明:在低环境照度下观看手机等显示器对眼睛产生的视疲劳程度较大,在屏幕亮度保持不变的情况下,随着环境照度的提高,视疲劳程度逐渐减小,当环境照度为100lux时对用户视疲劳的影响最小;当处于任一环境照度条件下,被试者通过智能手机完成视觉搜索任务的正确率远高于通过投影仪完成视觉搜索任务;在日常使用环境(0lux<环境照度<500lux)下,被试者通过智能手机完成视觉搜索任务后其闪光融合频率下降值明显小于观看投影仪的闪光融合频率下降值。因此传统教学环境投影仪模式对学生视疲劳与视觉绩效的影响程度要高于通过线上网课学习移动端智能手机模式对学生视疲劳的影响程度。

Based on considerations such as protecting students'eyesight,this article uses a combination of multiple fatigue detection methods such as flash fusion frequency and visual behavior performance to study the impact of smartphones and projectors on visual performance and visual fatigue under different environmental illumination indicators for students'online and offline learning assignments.The results show that viewing displays such as mobile phones under low ambient illuminance causes a greater degree of visual fatigue on the eyes.With the screen brightness unchanged,the degree of visual fatigue gradually decreases as the ambient illuminance increases.When the ambient illuminance is 100lux,the impact on user visual fatigue is minimal;Under any ambient illumination condition,the accuracy rate of subjects completing visual search tasks through smartphones is significantly higher than that through projectors;In a daily use environment(0lux<ambient illumination<500lux),the decrease in flash fusion frequency of subjects who completed visual search tasks through smartphones was significantly smaller than the decrease in flash fusion frequency of viewing projectors.Therefore,the impact of projector mode in traditional teaching environment on students'visual fatigue and visual performance is higher than the impact of mobile smartphone mode through online classes learning on students visual fatigue.