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To understand what insights an objective, visual behaviour monitor can provide clinicians about the visual requirements of patients.
Clinical and administrative staff of the department of ophthalmology at the University of Heidelberg wore the Visual Behavior Monitor (VBM, Vivior AG, Zurich, Switzerland) for 36 hours over the course of a week. The data was then analysed to identify visual behaviour patterns. The VBM consists of sensors measuring key parameters including distance, ambient light, orientation and motion. The device is attached to the frames of the wearer’s glasses using a magnetic clip.
19 subjects participated in the evaluation with an average age of 41 (Range, 24 to 61). The time spent between distance, intermediate and near visual tasks was almost equally split with an average of 33% of time spent at distance, 35% at intermediate and 32% at near. Subjects were stratified by task into 4 groups, which showed that Group 1 (secretaries, administration staff) spent more than 40% of their time working at near, while Group 2 (technicians, opticians) spent the majority of their time working at intermediate and Group 3 (various professions) worked primarily at distance. Finally, Group 4 (M.D.s) used spent their days working almost equally at the near, intermediate and distance.
Our experience with the VBM provided insight into how different tasks require different visual requirements – highlighting the fact that patients require a more customized approach to visual correction.