The operation microscope was equipped with two small camera heads on b
oth sides, with a 35-mm still camera, and with or without a binocular
observer tube. These camera heads were connected with a 3-dimensional
(3D) converter. The operater can observe the 3D images of the operatio
n field on a TV monitor through polarization glasses. The microscope w
ith two camera heads is easy to handle because these camera heads are
small and light. This is a promising monitoring system for microsurger
y.