Abstract
Ambient illuminance and screen luminance have a significant influence on the visual fatigue and visual performance associated with the use of computers. The current study was conducted to investigate optimal screen luminance under different ambient illuminances and fit a curve of the optimum luminance of LCD screens under evening illumination. Thirty-three participants were assigned to rate screen brightness, visual comfort with screen luminance, satisfaction with ambient illuminance and visual fatigue under six screen luminance levels (3.87, 21.47, 42.74, 64.12, 84.77 and 106.7 cd/m2) combined with five ambient illuminance levels (0, 25, 50, 75 and 100 lx) in the evening. The results showed that optimum LCD screen luminance increased with increasing ambient illuminance. Moreover, ambient illuminance and screen luminance levels should be in the range of 13.08–62.16 lx and 20.63–75.15 cd/m2, respectively, to obtain the optimal subjective feelings of visual fatigue and visual comfort during the evening.
Highlights
Computer vision syndrome (CVS), referred to as digital eye strain, describes a group of eye and vision-related problems that result from prolonged computer, tablet, e-reader and cell phone use [1,2,3,4]
Among all the influential factors, ambient illuminance and screen luminance seem to be the most influential [1,2] and have attracted much attention in previous studies; they are the focus of the current study
Visual comfort remains stable when the illuminance level achieves a comfortable threshold [16], and high illuminance (i.e., 1000 lx) can even cause dissatisfaction and discomfort and increase visual fatigue [17,18]. All these results suggest that relatively low or medium levels of ambient illuminance may be beneficial for enhancing visual comfort and minimizing visual fatigue
Summary
Computer vision syndrome (CVS), referred to as digital eye strain, describes a group of eye and vision-related problems (i.e., visual discomfort, visual fatigue, blurred vision, eye strain, dry eyes, irritated eyes, double vision, vertigo/dizziness, polyopia, headaches, neck pain, and difficulty refocusing the eyes) that result from prolonged computer, tablet, e-reader and cell phone use [1,2,3,4]. In a study by Ye et al (2014), participants were required to evaluate the display quality and visual fatigue associated with three different mobile phones (Samsung Galaxy S3, Nokia 920 and iPhone 4S) to investigate the optimal luminance under variable levels of ambient illuminance. They found that the optimal luminance levels for 0, 150, 300, 400, 600 and 800 lx were 55, 170, 308, 436, 470 and.
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