Jon wears glasses too. He said once that sometimes people ask him to put down his sunglasses when they meet him but he couldn't because the sunglasses are made how he needs them and without them he would be blind. And he wears glasses in the AAA-video. You can see that there are glasses and that the sunglasses (which he put up) are just in front of them.

Richie wears glasses for quite some time. There are older pics of him wearing them. I guess it has something to do with his spin in the eye but that's just a guess. He doesn't wear them in interviews or on stage but off stage he wears them. A pal of mine passed him once in 1998 where he wore glasses, too.