An experimental study on the duration of a single spell of work on VDT performance.

Misawa, Tetsuo; Yoshino, Kenji; Shigeta, Sadayoshi

doi:10.1539/joh1959.26.296

Cited by 29 publications

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“…Reddy et al added that looking at far objects frequently during work associated significantly with less frequent CVS symptoms [14]. Applying this rule showed improvement in work efficiency in previous studies [26,27]. Proper location of the screen is another measure that showed significant correlation with reduced risk of CVS.…”

Section: Discussionmentioning

confidence: 99%

Computer Vision Syndrome among Undergraduate Medical Students in King Abdulaziz University, Jeddah, Saudi Arabia

Abudawood

Ashi

Almarzouki

2020

Journal of Ophthalmology

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Introduction. Computer vision syndrome (CVS) is “a complex of eye and vision problems related to near work experienced during computer use.” It is one of the rising health concerns related to technology (cell phones and tablets) due to continuous use of computers among students. The aim of this study was to determine the prevalence of CVS, associated risk factors, and commonly associated symptoms and to assess the awareness and proper practice of using computers for studying. Methods. A cross-sectional descriptive study was conducted among 651 undergraduate medical students in King Abdulaziz University, Jeddah, Saudi Arabia. An electronic survey was conducted to collect the data. Data were analyzed using SPSS v21. The chi-square test (Fisher’s exact test when required) was used to study the significance of associations. P value <0.05 was considered statistically significant. Results. High prevalence of CVS was observed, in which 95% (558) reported at least one symptom during studying using computers. Most frequently reported symptoms were excessive tearing and neck, shoulder, or back pain. Female students had a higher risk of CVS (P=0.003). Students who are myopic or hyperopic showed no association. Astigmatism was associated significantly with CVS (P=0.03). Using spectacles or contact lens showed no association. Students with dry eye disease revealed a significant association with CVS (P=0.01). The most significant risk factors related to the daily usage of computer were longer duration of studying (P<0.001), short distance from the screen (P<0.05), and high brightness of the screen (P<0.05). The most significant preventive measure taken to relieve the symptoms was applying the 20-20-20 rule. Conclusion. CVS is common among medical students; significant risk factors need to be addressed to reduce the symptom and to ensure a better productivity of work. It is a necessity to raise awareness among medical students regarding computer-related health problems.

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Section: Discussionmentioning

confidence: 99%

Computer Vision Syndrome among Undergraduate Medical Students in King Abdulaziz University, Jeddah, Saudi Arabia

Abudawood

Ashi

Almarzouki

2020

Journal of Ophthalmology

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“…Signi® cant changes of VRT-M, VRT-SD and CFF after undertaking VDT work were observed in the high+noisy condition. There are reports of signi® cant changes in CFF after the VDT work (Kumashiro et al 1984, Misawa et al 1984. On the other hand, CFF showed no signi® cant change after 11 h of work on a calculating task (Kurimori et al 1994).…”

Section: Mental Activitiesmentioning

confidence: 97%

Combined effects of working environmental conditions in VDT work

et al. 2001

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The combined effects of city noise and luminance of the computer display were evaluated from the changes in lymphocytes and mental activities of participants. Healthy male students were tested under the following four experimental conditions: (1) a calculating task on a video display terminal (VDT) with luminance of 90 cd m(-2) without city noise; (2) a calculating task on a VDT with luminance of 20 cd m(-2) without city noise; (3) a calculating task on a VDT with luminance of 90 cd m(-2) with city noise of 70 dB(A); and (4) a calculating task on a VDT with luminance of 20 cd m(-2) with city noise of 70 dB(A). A visual reaction test (VRT) was performed, and critical flicker fusion frequency (CFF), heart rate (HR), numbers of circulating white blood cells (WBCs), lymphocyte subsets and subjective symptoms of fatigue were measured (1) before; (2) just after; and (3) 30 min after each 60 min test. Subjective symptoms of fatigue significantly increased just after experiments conducted under the two noisy conditions. VRT and CFF showed significant changes in the case of the high-luminance display with noise. WBCs and neutrophils showed significant increases in the two quiet conditions. These results suggested that high luminance with noise had the most effect on subjective fatigue and mental activities.

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“…It has been postulated that after working at a VDT for 20 minutes, the VDT user should look at a distance of more than 20 feet for at least 20 seconds (20/20/20 rule). This has shown to improve the work efficiency as well as address the issue of eye‐ strain …”

Section: Symptoms and Pathophysiologymentioning

confidence: 99%

Computer vision syndrome-A common cause of unexplained visual symptoms in the modern era

2017

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Recognising this condition in the clinic or in emergency situations like the TIA clinic is crucial. The implications are potentially huge in view of the extensive and widespread use of computers and visual display units. Greater public awareness of Computer vision syndrome and education of health professionals is vital. Preventive strategies should form part of work place ergonomics routinely. Prompt and correct recognition is important to allow management and avoid unnecessary treatments.

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An experimental study on the duration of a single spell of work on VDT performance.

Cited by 29 publications

References 0 publications

Computer Vision Syndrome among Undergraduate Medical Students in King Abdulaziz University, Jeddah, Saudi Arabia

Computer Vision Syndrome among Undergraduate Medical Students in King Abdulaziz University, Jeddah, Saudi Arabia

Combined effects of working environmental conditions in VDT work

Computer vision syndrome-A common cause of unexplained visual symptoms in the modern era

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