They sound like some great friends, but do let them know that the glasses don't really work - in case they go getting them for someone else in the future! Every once and a while a video post pops up here of some muppet putting them on and crying like they've just seen the face of god, and they always end up being called out on their nonsense. There's lots of videos on YT about this particular sham; Scishow has a good one if memory serves.