Designing and validation a visual fatigue questionnaire for video display terminals operators

Rajabi-Vardanjani, Hassan. and Habibi, Ehsanollah. and Pourabdian, Siyamak. and Dehghan, Habibollah. and Maracy, Mohammad Reza. (2014) Designing and validation a visual fatigue questionnaire for video display terminals operators. International Journal of Preventive Medicine, 5 (7). pp. 841-848.


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Background: Along with the rapid growth of technology its related tools such as computer, monitors and video display terminals (VDTs) grow as well. Based on the studies, the most common complaint reported is of the VDT users. Methods: This study attempts to design a proper tool to assess the visual fatigue of the VDT users. First draft of the questionnaire was prepared after a thorough study on the books, papers and similar questionnaires. The validity and reliability of the questionnaire was confirmed using the content validity index (CVI) beside that of the Cronbach's Coefficient Alpha. Then, a cross-sectional study was carried out on 248 of the VDT users in different professions. A theoretical model with four categories of symptoms of visual fatigue was derived from the previous studies and questionnaires. Having used the AMOS16 software, the construct validity of the questionnaire was evaluated using the confirmatory factor analysis. The correlation co-efficiency of the internal domains was calculated using the SPSS 11.5 software. To assess the quality check index and determining the visual fatigue levels, visual fatigue of the VDT users was measured by the questionnaire and visual fatigue meter (VFM) device. Cut-off points were identified by receiver operating characteristic curves. Results: CVI and reliability co-efficiency were both equal to 0.75. Model fit indices including root mean of squared error approximation, goodness of fit index and adjusted goodness of fit index were obtained 0.026, 0.96 and 0.92 respectfully. The correlation between the results measured with the questionnaire and VFM-90.1 device was-0.87. Cut-off points of the questionnaire were 0.65, 2.36 and 3.88. The confirmed questionnaire consists of four main areas: Eye strain (4 questions), visual impairment (5 questions) and the surface impairment of the eye (3 questions) and the out of eye problems (3 questions). Conclusions: The visual fatigue questionnaire contains 15 questions and has a very remarkable validity and reliability. Usingthis questionnaire and its findings, one will be able to identify, assess and finally prevent the effective factors of VDT users' visual fatigue.

Item Type: Article
Additional Information: cited By 4
Uncontrolled Keywords: adult; article; computer program; construct validity; content validity; cross-sectional study; diagnostic test accuracy study; eye disease; factorial analysis; fatigue; female; human; human computer interaction; instrument validation; major clinical study; male; operator; ophthalmological equipment; questionnaire; reliability; sensitivity and specificity; video display terminal operator; visual fatigue; visual fatigue meter device; Visual Fatigue Questionnaire
Subjects: WA Public Health
Divisions: Reserach Vice-Chancellar Department > Modeling in Health Research Center
Depositing User: zahra bagheri .
Date Deposited: 02 Aug 2017 05:01
Last Modified: 15 Apr 2018 09:27

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