• P J Clamp and S J Broomfield.
• Department of ENT Surgery, University Hospitals Bristol and Weston NHS Foundation Trust, St Michael's Hospital, Bristol, UK.
• J Laryngol Otol. 2020 Aug 1; 134 (8): 739-743.

ObjectiveMastoidectomy is considered an aerosol-generating procedure. This study examined the effect of wearing personal protective equipment on the view achieved using the operating microscope.MethodsENT surgeons assessed the area of a calibrated target visible through an operating microscope whilst wearing a range of personal protective equipment, with prescription glasses when required. The distance between the surgeon's eye and the microscope was measured in each personal protective equipment condition.ResultsEleven surgeons participated. The distance from the eye to the microscope inversely correlated with the diameter and area visible (p < 0.001). The median area visible while wearing the filtering facepiece code 3 mask and full-face visor was 4 per cent (range, 4-16 per cent).ConclusionThe full-face visor is incompatible with the operating microscope. Solutions offering adequate eye protection for aerosol-generating procedures that require the microscope, including mastoidectomy, are urgently needed. Low-profile safety goggles should have a working distance of less than 20 mm and be compatible with prescription lenses.

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