Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 99.95; Flight Crew Total 13003.13; Flight Crew Type 997.17
Other / Unknown; Physiological - Other
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Environment - Non Weather Related; Human Factors
With about 4 hours to go before landing; I had just emerged from the crew rest bunk when Lead Flight Attendant asked me if I could have the flight deck crew wear a face mask when a Flight Attendant was in the cockpit in flight. I told her no for the safety of flight reasons. I did not add anything further.I personally was not going to wear a face mask in the cockpit since I would be in the cockpit for the rest of the flight. I am required by the FAA on my medical 'Must wear corrective lenses; possess glasses for near/intermediate vision.' Since my glasses fog up every time I wear any type of face mask I know that wearing a mask at my flight deck seat is a safety of flight issue. About two hours later when the Lead came to in to give us a restroom break we; First Officer and I; offered her an N95 mask to wear for her safety and set it on the pedestal for her. She did not put it on and chose to wear what appeared to be a non-N95 certified black cloth mask.
Air Carrier Captain reported telling the Lead Flight Attendant that he would not be wearing a face mask in the flight deck due to safety of flight reason as his glasses fog up when wearing a face mask.