As part of an ergonomic intervention, a complete optometric examination was given, and corrections specially designed for VDU workstations were supplied. A significant reduction of visual symptoms was observed. A control group was followed without intervention for 3 years, and no similar reduction of visual problems was observed in this group. After ergonomic and optometric intervention in the control group, a reduction of symptoms was observed also in the control group. The total observation time was 6 years.
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