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Optimal correction in spectacles: intervention effects on eyestrain and musculoskeletal discomfort among postal
H Hemphälä1, P Nylén2, J Eklund2
1Division of Ergonomics and Aerosol Technology, Department of Design Sciences, Lund University, Lund, Sweden.
Background:
The static posture of postal workers when sorting mail can lead to musculoskeletal discomfort. Research has shown a connection between eyestrain and upper-body musculoskeletal discomfort in general, including postal workers. A previous study of postal workers found that most of those with eye strain were in need of a new correction in their existing spectacles.
Objective:
Evaluate intervention effects on eyestrain and musculoskeletal discomfort with new spectacles for postal workers.
Methods:
Postal workers subjectively reported eyestrain, musculoskeletal discomfort and their opinions of the visual environment via questionnaires pre- and post-intervention. After an eye examination the postal workers were divided into two groups: those who needed new spectacles and those who did not.
Results:
Those who needed new spectacles showed a higher prevalence of eyestrain and musculoskeletal discomfort pre-intervention. Post-intervention, the postal workers rated their vision better and the average eyestrain and musculoskeletal discomfort decreased for both groups. These workers also experienced a decrease in discomfort on the left (static) side of the neck while sorting mail.
Conclusion:
An intervention providing the optimal correction reduces eyestrain and decreases musculoskeletal discomfort, especially from the neck.
