C Hinecap.
You've come across as naive and foolish. There's no point in trying to come across as all intellectual with your "myopic" comments, etc. You've got it wrong and ought to admit it. As aircrew we have to wear certain brands of lens. That is RAF specified. And we pay cost price. The end. There's no special treatment for us aircrew. So get over it. Please put it to bed. All we are endeavouring to do is to find out the process.