“The eyes lead the body.” A good visual environment is important for performance and wellbeing. Unsatisfactory visual conditions often induce a strained posture, more or less unconsciously, in an effort to improve vision. The requirements for the visual environment in an operating theatre are high. Surgeons or assistants who are having visual problems can induce treatment hazards. The purpose of this study was to evaluate the visual environment in operating theatres, and also examine if the surgeon's visual acuity at near work can be improved with better glasses. Thirty percent of the surgeons had eyestrain, and those with eyestrain had three times as much musculoskeletal strain. The measurements of the illuminance and luminance show a low uniformity level on the operating table; the operating lamps give an average of 100.000 lux, while the surrounding area values are much lower. The most important recommendation for lighting intervention in the operating theatre is a more uniform illuminance on the operating table.
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