title: The vertical monitor position for presbyopic computer users with progressive lenses: how to reach clear vision and comfortable head posture.
abstract: When presbyopic employees are wearing general-purpose progressive lenses, they have clear vision only with a lower gaze inclination to the computer monitor, given the head assumes a comfortable inclination. Therefore, in the present intervention field study the monitor position was lowered, also with the aim to reduce musculoskeletal symptoms. A comparison group comprised users of lenses that do not restrict the field of clear vision. The lower monitor positions led the participants to lower their head inclination, which was linearly associated with a significant reduction in musculoskeletal symptoms. However, for progressive lenses a lower head inclination means a lower zone of clear vision, so that clear vision of the complete monitor was not achieved, rather the monitor should have been placed even lower. The procedures of this study may be useful for optimising the individual monitor position depending on the comfortable head and gaze inclination and the vertical zone of clear vision of progressive lenses.
  For users of general-purpose progressive lenses, it is suggested that low monitor positions allow for clear vision at the monitor and for a physiologically favourable head inclination. Employees may improve their workplace using a flyer providing ergonomic-optometric information.
authors.affiliation: a Leibniz Research Centre for Working Environment and Human Factors , Ardeystraße 67, D-44139 Dortmund , Germany.
authors.forename: Patrick
authors.initials: P
authors.lastname: Weidling
authors.affiliation: a Leibniz Research Centre for Working Environment and Human Factors , Ardeystraße 67, D-44139 Dortmund , Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Jaschinski
mesh_terms: D000328:Adult; D003201:Computers; D004779:Environment Design; D004867:Equipment Design; D006804:Ergonomics; D005139:Eyeglasses; D005260:Female; D006257:Head; D006801:Humans; D008297:Male; D008875:Middle Aged; D011187:Posture; D011305:Presbyopia / Q000534:rehabilitation*
keywords: computer work; musculoskeletal symptoms; presbyopia; progressive lenses