Mansour Ziaei, Hamed Yarmohammadi, Meisam Moradi, Faramarz Gharagozlou,
Volume 1, Issue 3 (3-2014)
Abstract
Introduction: Working with Visual Display Terminals (VDTs) can be associated with visual complaints particularly visual fatigue and symptoms including headache, disruption in continuing the work and ocular disorders. The objective of the present study was to determine the prevalence of visual fatigue and its related risk factors in computer users of Kermanshah University of Medical Sciences in 2013.
Materials and Methods: This descriptive-analytical study was achieved on 260 computer users. The data were collected by Visual Fatigue, demographic and job questionnaires. For data analysis, Spearman, Mann-Whitney and Kruskal-Wallis tests were used.
Results: The mean (SD) age of the users was 36.74 (7.74) and daily working time with VDTs was 5.85 (2.28) hours. Visual fatigue score was 2.99 (1.97), so that 32.3% of computer users had severe eye fatigue. Meanwhile, 45.4, 21.9, 32.7 and 46.2 percentage of users suffered severely from eye strain, visual impairment, eye-surface disorder and extra-ocular problems. Visual fatigue incidence and its compliments were significantly increased with increasing of age, work experience and daily working hours with computer (p<0.05). Visual fatigue was higher in users wearing glasses than those not wearing glasses (p<0.001) and was lower in monitor to window angle of 90º than two other monitor to window positions of 0º (p=0.041) and 180º (p=0.036).
Conclusion: The prevalence of visual fatigue among computer users was very high. Visual fatigue and its serious consequences can be prevented by applying the principles of ergonomics such as regular and short breaks, looking at distant objects, blinking regularly and reducing the direct and indirect glares.
Zahra Sadat Sharifi, Rasoul Hemmatjo, Abolfazl Ghahramani,
Volume 13, Issue 3 (9-2025)
Abstract
Objectives: Nowadays, electronic devices such as computers, mobile phones, and tablets have played an important role in people's work and lives, and the main complaint of users of video terminals is eye symptoms caused by them. This study aimed to evaluate the intensity of lighting and brightness and its possible relationship with visual fatigue in users of video terminals at Tabriz University of Medical Sciences.
Methods: This cross-sectional study was conducted on 171 users of video terminals at Tabriz University of Medical Sciences. In this study, the local illuminance intensity at the work surface and the luminance intensity from the screen at the user's eye level were measured. A 15-question visual fatigue questionnaire was used to assess visual fatigue. The results were analyzed using paired t-tests and chi-square tests using SPSS software.
Results: In this study, the average local illumination intensity on the desk was 306.6 lux and the average luminance intensity was 73.9 candelas per square meter. Local illumination intensity was lower than the recommended level in 41.6 percent of cases. There was no statistically significant relationship between illumination intensity and users' vision during the study, and there was also no statistically significant relationship between users' luminance and vision. The results of this study showed that vision at the end of the work has a significant relationship with the individual's vision at the beginning of the work. The results of this study also showed that there is a significant relationship between visual fatigue and the type of work.
Conclusion: According to the findings of the study, it is recommended that, if possible, the time to start working with visual terminals should be when there is no feeling of visual fatigue. Also, since one of the factors affecting visual fatigue is the type of work, it is recommended that users manage their work in such a way that they are mostly inactive (reading the page).
