Optx 20/20
HFD,
I’m not sure what type my lenses actually are. A friend got them for me, I think from the ‘States, some years ago.
A quick Google indicates that OPTX 20/20 are something very similar, in fact it may be the same brand. It’s cheaper than prescription sunglasses, particularly if you already have the sunglasses.
Safe Flying,
Richard W.