Conclusion
This study demonstrates that PPE including an FFP-3 mask and full-face
visor is incompatible with use of the operating microscope; the view of
the surgical field was reduced to below 10% in most cases. Urgent
consideration needs to be given to solutions that allow for concurrent
use of the operating microscope and drill that are required for mastoid
surgery, whilst affording the surgeon adequate protection from viral
transmission in the COVID-19 era.