The event at Merlwood got me thinking that maybe the chocobros like to mess around with iggy and his glasses. I see Prompto trying on Iggy's glasses and dragging along Noctis to put on Iggy's spare pair too. But any or all of them could be wearing his glasses. Poor iggy couldn't be mad at having unclear vision 'cause he finds his newly-bespectaled bros too cute. Bonus points if Ignis already knows he has a glasses fetish
+ gladio feeling left out and wrestling the bros for attention
+ gladio finding noct and prom cuter with glasses on and ignis hotter without glasses on.