I want no unseemly mirth at this very informative posting.
Many years ago on Hong Kong TV there was an advert featuring a now long retired CX very senior pilot, (CXVSP)
The ad went something like this.
CXVSP, seated at the controls, turned round to the camera behind his seat with his hands raised and said something like
"I fly hundreds of thousands of passengers every year and their safety is in these hands. I need the best protection for my eyes I can get and I use Zeiss," (puts on sunglasses).
"Zeiss for my eyes!!"
There you have it ladies and gentlemen from the most impeccable of sources.
Remember now, no laughing (choke)