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Related Experiment Video

Updated: Jun 9, 2026

Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher

Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher

Published on: February 23, 2018

Eye-lens accommodation load and static trapezius muscle activity.

H O Richter¹, T Bänziger, M Forsman

¹Musculoskeletal Research, Department of Occupational and Public Health Science, Faculty of Health and Working Life, University of Gävle, 801 76, Gävle, Sweden. hrr@hig.se

European Journal of Applied Physiology

|August 31, 2010

Summary

Sustained near vision with added blur increases neck muscle activity. This eye strain may be a risk factor for trapezius muscle pain, especially in poor ergonomic conditions.

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Area of Science:

Ergonomics
Ophthalmology
Neuromuscular Physiology

Background:

Neck and scapular muscle activity is crucial for posture and visual tasks.
Oculomotor load, particularly during prolonged near work, is a common occupational stressor.
Understanding the link between visual demand and neck muscle strain is essential for preventing musculoskeletal disorders.

Purpose of the Study:

To investigate the impact of sustained oculomotor load on neck and scapular muscle activity.
To determine if accommodative effort in unfavorable viewing conditions affects trapezius muscle activity.
To explore potential risk factors for trapezius muscle myalgia.

Main Methods:

Experimental study involving 28 subjects (mean age 29).
Assessed static trapezius muscle activity using surface electromyography.
Subjects viewed a target through -3.5 D and 0 D lenses for two 5-min periods.
Accommodative response measured via infrared photorefraction.

Main Results:

Higher accommodative response in the -3.5 D blur condition correlated with increased bilateral trapezius muscle activity.
No significant muscle activity relationship was observed during the no-blur (0 D) condition.
Sustained eye-lens accommodation at near, under adverse ergonomic conditions, showed a potential link to muscle strain.

Conclusions:

Sustained eye-lens accommodation at near can increase trapezius muscle activity.
Ergonomically unfavorable viewing conditions combined with accommodative demand may pose a risk for trapezius muscle myalgia.
This study highlights the interplay between visual tasks and musculoskeletal health in the neck and shoulder region.