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Working spectacles for sorting mail.

Hillevi Hemphälä1, Camilla Dahlqvist2, Catarina Nordander2

  • 1Department of Design Sciences, Faculty of Engineering, Lund University, Lund, Sweden.

Work (Reading, Mass.)
|January 23, 2014
PubMed
Summary

Customized spectacles reduced head and neck inclination for mail sorters, potentially lowering musculoskeletal disorder risk. However, increased neck forward flexion and sorting time were observed, warranting further investigation into alternative lens designs.

Keywords:
EMGPostmeninclinometryprogressive lenseswork progressive spectacles

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Area of Science:

  • Occupational health
  • Ergonomics
  • Ophthalmology

Background:

  • Mail sorting is visually demanding, often causing head backward inclination.
  • Progressive addition lenses can exacerbate head and neck strain in postmen.

Purpose of the Study:

  • To assess the impact of customized working spectacles on postmen's physical workload.
  • To evaluate the effectiveness of inverted progressive lenses in reducing occupational strain.

Main Methods:

  • Twelve male postmen participated in the study.
  • Comparison of mail sorting using private progressive spectacles versus customized sorting spectacles with inverted progressive lenses.
  • Measurement of head, neck, upper back, and upper arm postures using inclinometry.
  • Assessment of trapezius muscle load via surface electromyography.

Main Results:

  • Customized spectacles significantly reduced backward head inclination (3°) and neck backward flexion.
  • A reduction in the muscular load of the right upper trapezius was observed.
  • A trend towards increased neck forward flexion and longer sorting times was noted with the customized spectacles.

Conclusions:

  • Reduced head backward inclination may decrease the risk of work-related musculoskeletal disorders.
  • Increased neck forward flexion with customized spectacles could mitigate positive effects.
  • Further research on alternative spectacles, such as those with inverted near progressive lenses, is recommended to optimize benefits.