I knew I'd bought two pairs with the fancy coatings and suchlike, one oblong and plastic, one round and metal, but I lost the latter shortly after purchase. Never did know what had happened to them. Now I do.
And gosh, things look so much better than my scratched-up pair from . . . well, 2008 as well, but I've been using them them and the coating's worn away. These are mint - colours are more saturated and everything looks that bit sharper. I'm getting that headache that I do when my prescription has changed, but man, it's worth it.