Abstract
PurposeWe 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.DesignProspective, observational, cohort study.MethodSetting: 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.ResultsThe 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.ConclusionIn our study, the use of visually guided picking solutions was correlated with post-task subjective symptoms and tear film instability.
Highlights
Computer-aided manual order picking solutions are widely used, primarily in pick-by-voice systems
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
The tear break-up time (BUT) values declined significantly in the visual condition 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 or even increased over the time
Summary
Computer-aided manual order picking solutions are widely used, primarily in pick-by-voice systems. The development of near eye display devices has created myriad new opportunities. One such opportunity is the use of manual sorting systems that visually guide operators in the picking process. Pick-by-voice systems are proven technologies and commonly used for commissioning of orders, visually guided picking system technology are currently still in an experimental stage. The workload associated with the use of a visually guided commissioning system has not yet been investigated. This system require workers to wear a headset with a see-trough display for one eye, enabling the transmission of information by augmenting visual perception via a projection in the field of vision. The purpose of this study was to investigate ocular comfort, ocular surface and tear function parameters before and after the completion of a task using either a visual- or a voiceguided picking solution
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