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Updated: Jun 25, 2026

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Objective Assessment of Visual Workload in Video Display Terminal Workers Using a Non-Invasive Monitoring System.

Edoardo Marelli1, Davide Ruongo1, Giacomo Beschi2

  • 1Unit of Occupational Health and Industrial Hygiene, Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, University of Brescia, Brescia, Italy.

La Medicina Del Lavoro
|June 24, 2026
PubMed
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This summary is machine-generated.

Objective screen time measurement in video display terminal (VDT) operators revealed significant visual workload but no direct link to ocular issues or fatigue. This method offers better risk assessment for VDT workers.

Area of Science:

  • Occupational Health
  • Ophthalmology
  • Human-Computer Interaction

Background:

  • Video display terminal (VDT) operator risk assessment often uses inaccurate self-reported data.
  • Objective measurement of visual workload is needed for accurate occupational health surveillance.
  • Understanding visual workload's impact on ocular health is crucial.

Purpose of the Study:

  • To objectively measure active screen fixation time in VDT workers.
  • To explore the relationship between screen fixation and ocular surface alterations.
  • To investigate associations with fatigue-related indicators.

Main Methods:

  • Observational cross-sectional study of 38 hospital booking center administrative workers.
  • Objective measurement of VDT screen fixation using a patented video-based system.

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  • Ophthalmological evaluations (OSDI®, BUT, slit-lamp) and fatigue assessments (blink rate, PERCLOS, FAS).

    • Main Results:

    • Active screen fixation comprised ~60% of total working time.
    • Nearly half (47%) of workers showed pathological tear break-up time (BUT).
    • No significant associations found between fixation time and ocular/fatigue outcomes; blink rate and PERCLOS were physiological.

    Conclusions:

    • Objective screen fixation measurement provides a more accurate visual workload assessment than indirect methods.
    • This approach can enhance occupational health surveillance for VDT-exposed workers.
    • Supports improved risk assessment strategies for VDT operators.