A visual ergonomics intervention in mail sorting facilities: Effects on eyes, muscles and productivity

► This lighting intervention study with postmen has studied productivity, MSD, eyestrain, wellbeing and the lighting situation. ► Good lighting conditions, good visibility of the tasks and the person's visual ability is important. ► There was a relationship between eyestrain and MSD: Those with eyestrain had three times as much MSD. ► In this study the young postmen with eyestrain had the greatest benefits from the lighting intervention, including decreased eyestrain, MSD and sorting time.