Visual comfort in using different VDT screens

Abstract

In order to meet the goal of user comfort of information displays, visual problems of video display terminal (VDT) work were studied through the analysis of visual functions in two experiments. Eye movement analysis, in Experiment 1, revealed that VDT operators had to move their eyes 2.5 times faster than traditional clerical workers. Lens accommodation, pupil size, and subjective visual comfort were investigated in Experiment 2. A significant correlation was found between the velocity of lens accommodation and the subjective visual comfort while viewing seven different displays (r = .809). A positive-type cathode-ray tube (CRT), which has dark characters on a light background, was ascertained to be the most appropriate display type, while working with a liquid crystal display (LCD) was considered to be the least visually comfortable, with the lowest accommodative velocity.

Visual fatigue during VDT work: Effects of time-based and environment-based conditions

“…TFT-LCD offers superior visual performance to CRT [13]. On the other hand, Saito et al [8] and Hollands et al [15] reported that working with an LCD screen may be less comfortable than CRT, and moreover, it was associated with longer response times. These contradictory results demonstrated that the influence of screen type on visual fatigue and performance remains uncertain.…”

“…and environmentbased factors (such as close viewing distance, low luminance contrast, etc.). VDT operators typically have to move their eyes faster than clerical workers performing traditional work tasks, such as reading and writing without VDTs [8]. The high density office work created by the introduction of VDTs may cause VDT-related complaints [9].…”

An Ergonomic Questionnaire Survey on the Use of Computers in Schools.

“…Displays and keyboards, whose optical and physical characteristics are totally different from those of paper and pencil, caused a sharp increase in the number of users experiencing eye fatigue, pain or dryness, shoulder stiffness, and back and low back pain. Among the many subsequent surveys and experimental studies, Saito observed that when working at a computer one's posture tends to become more tightly restrained and eye movement busier than when writing with "pencil and paper" 1) , Sotoyama noted that the ocular surface area, the surface area of the eyeball which exposed to the air, increases due to upward gaze 2) , and Abe pointed out a decrease in tears during upward gaze 3) all referred to as among causative factors in shoulder stiffness or eye pains.…”

Alzheimer: lisibilité du texte sur ordinateur ?

“…La plupart des articles [14,15] recommandent un fond blanc (meilleur contraste) et des caractères noirs, mais cela pour des personnes ayant une bonne acuité visuelle. Les personnes âgées ayant pour la plupart des déficits visuels, le fond blanc n'est pas adapté.…”