Newly designed sterilization system for the operating microscope: a technical note.

A new sterilization system for the operating microscope is introduced. The system, which uses formaldehyde vapor, has three advantages: (a) Rapid sterilization can be achieved with the microscope in place in the operating room within one-half hour. (b) The lens assembly of the microscope is protected against damage through ammonia neutralization and fresh air ventilation. (c) The microscope can be used immediately after sterilization without unpleasant odor or irritation of the eyes and nose.