The Impact of Visual Guided Order Picking on Ocular Comfort, Ocular Surface and Tear Function

PLoS One. 2016 Jun 17;11(6):e0157564. doi: 10.1371/journal.pone.0157564. eCollection 2016.


Purpose: We investigated the effects of a visual picking system on ocular comfort, the ocular surface and tear function compared to those of a voice guided picking solution.

Design: Prospective, observational, cohort study.

Setting: Institutional.

Study population: A total of 25 young asymptomatic volunteers performed commissioning over 10 hours on two consecutive days.

Main outcome measures: The operators were guided in the picking process by two different picking solutions, either visually or by voice while their subjective symptoms and ocular surface and tear function parameters were recorded.

Results: The visual analogue scale (VAS) values, according to subjective dry eye symptoms, in the visual condition were significantly higher at the end of the commissioning than the baseline measurements. In the voice condition, the VAS values remained stable during the commissioning. The tear break-up time (BUT) values declined significantly in the visual condition (pre-task: 16.6 sec and post-task: 9.6 sec) in the right eyes, that were exposed to the displays, the left eyes in the visual condition showed only a minor decline, whereas the BUT values in the voice condition remained constant (right eyes) or even increased (left eyes) over the time. No significant differences in the tear meniscus height values before and after the commissioning were observed in either condition.

Conclusion: In our study, the use of visually guided picking solutions was correlated with post-task subjective symptoms and tear film instability.

MeSH terms

  • Adult
  • Dry Eye Syndromes / drug therapy*
  • Dry Eye Syndromes / physiopathology
  • Eye / physiopathology*
  • Face
  • Female
  • Humans
  • Humidity
  • Lens Diseases / drug therapy*
  • Lens Diseases / physiopathology
  • Male
  • Middle Aged
  • Tears / physiology*
  • Vision, Ocular / physiology
  • Visual Acuity / physiology

Grant support

The authors have no support or funding to report.