Workstation variables and visual discomfort associated with VDTs

Area of Science:

• Occupational health
• Ergonomics
• Ophthalmology

Background:

• Visual display terminals (VDTs) are ubiquitous in modern workplaces.
• Prolonged VDT use is associated with various user symptoms, including visual discomfort and postural issues.
• Understanding the specific workstation factors contributing to these symptoms is crucial for improving user well-being.

Purpose of the Study:

• To investigate the impact of workstation factors on visual and postural symptoms in VDT users.
• To determine the relative contribution of screen legibility, stability, glare, and head posture to reported symptoms.
• To identify key ergonomic and visual factors that can be modified to reduce user discomfort.

Main Methods:

• A study involving 92 VDT users who maintained a daily diary for five working days.
• Systematic analysis of each workstation, assessing screen legibility, stability, glare (discomfort and disability), and required head postures.
• Application of multiple regression analysis to correlate workstation factors with reported visual and postural symptoms.

Main Results:

• Screen legibility was found to be a significant factor influencing the occurrence of ocular discomfort symptoms.
• Vertical head movements were significantly associated with the incidence of postural and headache symptoms.
• The study highlights the quantifiable impact of specific workstation elements on user-reported health issues.

Conclusions:

• Improving screen legibility is essential for mitigating ocular discomfort in VDT users.
• Minimizing adverse head postures through ergonomic adjustments can reduce the likelihood of headaches and postural strain.
• These findings provide evidence-based recommendations for optimizing VDT workstations to enhance user health and comfort.