It might be a surprise :
I`m an aged , old school , master optician/ophthalmologist , who , here in Germany , has/had learned , whatever he recommends and sells , should be able to make by himself .
Well , we dinosaurs are slowly dying out ... since nearly no one of the so called "next generation" likes to have blisters, sore muscles, black hands, joy in creating things with their own hands, but who prefer to press keys on their computers without knowing what they are actually doing ...
Yes - I'm proud to be one of the last dinosaurs and love to share my expertise to those , who , like me , love to learn from my mistakes and successes
Your's sincerely , enfield