Central nervous system effects and visual fatigue in VDT workers

  title={Central nervous system effects and visual fatigue in VDT workers},
  author={Katsuyuki Murata and Shunichi Araki and Norito Kawakami and Y Saito and E Hino},
  journal={International Archives of Occupational and Environmental Health},
  • K. Murata, S. Araki, E. Hino
  • Published 1991
  • Psychology
  • International Archives of Occupational and Environmental Health
SummaryTo assess central nervous system effects and visual fatigue induced by work with visual display terminals (VDT), symptom frequency was assessed and visual evoked potential (VEP), critical flicker fusion (CFF) and near-point distance were measured in 24 female keypunchers before and after 2.5 h of VDT work and in 6 non-VDT-exposed subjects at the same intervals. Each keypuncher had been engaged in data entry for 1–7 (mean, 4) years. After VDT work, the number of complaints of subjective… 
Accumulation of VDT work-related visual fatigue assessed by visual evoked potential, near point distance and critical flicker fusion.
It is suggested that VDT work probably affects visual function assessed by the VEP, NPD and CFF, and visual fatigue due to long-term VDTWork may tend to be accumulated day by day.
Effects of taurine supplementation on VDT work induced visual stress
It is suggested that taurine supplementation alleviates visual fatigue induced by visual display terminals (VDT) work.
A Neurophysiologic Study of Visual Fatigue in Stereoscopic Related Displays
Two tasks were investigated in this study. The first study investigated the effects of alignment display errors on visual fatigue. The experiment revealed the following conclusive results: First, EEG
Changes in the ocular and psychophysiological functions before and at the end of the workday provide a good objective index of VDT-induced «ocular» and central nervous system fatigue, which can be used for intervention research.
Acute effects of alcohol on cognitive function and central nervous system assessed by auditory event-related potentials.
The data suggest that ethanol, in proportion to its dose, affects cognitive function estimated by the P300 latency earlier than other lower central nervous system functions, and is positively correlated with the ethanol dose per body weight.
Effects of astaxanthin on accommodation, critical flicker fusion, and pattern visual evoked potential in visual display terminal workers
Findings of the present study indicated that accommodation amplitude improved after astaxanthin supplementation in VDT workers.
[Effect of mental fatigue induced by repeated continuous calculation tasks on event-related brain potential (P300)].
  • N. Okamura
  • Biology
    Sangyo eiseigaku zasshi = Journal of occupational health
  • 2007
A prolongation of the latency of P300 after the task was detected in all subjects and the changes in the concentrations of lactic acid and cortisol and the reaction time were not induced by the continuous addition task.
Effect of yoga on visual perception and visual strain
Visual perception implies that additional features of a visual stimulus are extracted and cognized. Yoga practice improved the response to a flickering light stimulus, so that it continues to be
Evaluating the Effectiveness of Using Electroencephalogram Power Indices to Measure Visual Fatigue
The EEG β and EEG α were effective for measuring visual fatigue in short- and long-duration tasks, respectively, and were the most effective power indexes for the visual fatigue measure.


[Effects of visual and mental strain on VDT (visual display terminal) performance].
The progression of visual and mental strain in VDT work was investigated through an experimentally-designed VDT task providing a number of stressors including pacing, repetition, judgment and output decisions to measure the effects of CFF, TAF, EEG, and near-point accommodation of various changes in the duration of the testing period.
Visual evoked potentials as indicators of the workload at visual display terminals.
Both indicators of fatigue, the amplitude of the VEP and the reaction time, proved to be sensitive to the workload of the task, and VEPs are an indicator of the workforce of a visual task.
[An experimental study on the duration of a single spell of work on VDT (visual display terminal) performance].
The results of this study suggest that in order to reduce operators' fatigue on VDT work of the conversation type, countermeasures such as shortening the duration of a single spell of work to less than 60 minutes and taking frequent short intermission are necessary.
Eye-strain and changes in accommodation of the eye and in visual evoked potential following quantified visual load.
The results showed that the relaxation time in accommodation lengthened and the latency of the positive wave appearing at about 100 ms in VEP increased with the increase in visual load.
[An experimental study of work load on VDT performance. Part 2. Effects of difference in input devices].
Effects of the difference in input device on work load of VDT task were studied and the frequency of both blinking and pupil-size changes were lower in the subjects using the lightpen compared to those using the keyboard, suggesting that the gaze time of the VDT screen with lightpen-condition is longer than that in keyboard-condition.
Central and peripheral nervous system dysfunction in workers exposed to lead, zinc and copper
Zinc and copper appear to antagonize strongly the lead-induced conduction delay in the upper central nervous system, but only weakly in the lower central and peripheral nervous systems.
[Factors affecting subjective symptoms of VDT workers].
A remarkable relationships were observed between psychological burden factors (for example: self-control of V DT work, sensation of excessive VDT work) and subjective symptoms of the VDT workers (both sexes).
Visual evoked potentials: relation to adult speechreading and cognitive function.
This study investigated the putative relationship between visual evoked potentials (VEPs) and specific aspects of speechreading and found significant correlations for some context-free word discrimination and sign-alphabet testing conditions.
Visual evoked potential in patients with cerebral asthenopia
The amplitude difference in VEP, as an objective correlate of asthenopia, is probably modal specific and suggests involvement of the visual cortex and VEP is unsuitable as a diagnostic tool due to the great overlap between amplitudes in asthenopic patients and control subjects.
Effects of Repetitive Tasks with Different Degrees of Difficulty on Critical Fusion Frequency (CFF) and Subjective State
Abstract Critical Fusion Frequency (CFF) and subjective state assessed by questionnaires were determined on 18 subjects during three different types of repetitive tasks of three hours duration. The