I was surprised at how strict they were being with loose articles, of any kind, yesterday. My first two rides I rode with my glasses (didn't have a strap with me, I've never needed it on any coaster in Florida, only on Falcon's Fury have they said anything) with no issue, and then the next two rides they took them, my 5th ride I just gave them to the ops (I kept getting stuck on the load side outside seat). So best bet is to make sure you have a strap for your glasses/sunglasses, at least for Mako. I'm willing to bet things are still the same on Kraken and Manta, they don't care.