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Related Experiment Videos

Do specially designed visual display unit lenses create increased postural load compared with single-vision lenses

Gunnar Horgen1, Arne Aarås, Helene Kaiser

  • 1Buskerud College, Department of Optometry, Kongsberg, Norway. gunnar.horgen@hibu.no

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|March 1, 2002
PubMed
Summary

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Specially designed visual display unit (VDU) lenses showed no significant difference in muscle load compared to standard lenses. However, small variations in head angle suggest potential benefits for optometrists optimizing VDU work conditions.

Area of Science:

  • Optometry
  • Ergonomics
  • Biomedical Engineering

Background:

  • Visual display unit (VDU) work is prevalent, often leading to postural strain.
  • Standard single-vision lenses may not adequately address the visual demands of VDU tasks.
  • New spectacle lens designs aim to mitigate postural load during prolonged screen use.

Purpose of the Study:

  • To compare the postural load associated with specially designed VDU spectacle lenses versus single-vision lenses.
  • To evaluate the impact of different lens corrections on muscle activity and body posture.
  • To determine the efficacy of novel VDU lens designs in improving visual ergonomics.

Main Methods:

  • Electromyography (EMG) was used to measure muscle loads in the trapezius and infraspinatus muscles.

Related Experiment Videos

  • Inclinometers recorded continuous body posture data from the head, back, and upper arm.
  • Comparison between three VDU lens types and standard single-vision lenses.

    • Main Results:

    • No statistically significant differences in muscle load were observed between VDU lenses and single-vision lenses.
    • Minor, non-significant differences were noted in the head angle measurements.
    • Electromyography and inclinometry data provided objective measures of postural load.

    Conclusions:

    • The tested VDU spectacle lenses did not demonstrate a significant reduction in muscle load compared to single-vision lenses.
    • While muscle load differences were minimal, subtle head angle variations indicate potential ergonomic considerations.
    • These lens designs offer optometrists new avenues for optimizing visual conditions for VDU users.