I don't think he would wear them at airports if he was long-sighted, maybe he just doesn't want to be recognized. Idk. If he was both short-and long sighted then he would wear glasses or lenses all the time. But on the close-up pictures you can see that he doesn't wear contact lenses. So I don't know.
Maybe his prescription is very mild so he doesn't really need to wear glasses or contacts normally? I guess you don't really need 20/20 vision while skating