Golden Wind Glasses/Eyesight Headcanons!
Most of these are from a convo with @heliantyr hi Heliah
Fugo
He only wears glasses if they're cool enough. He doesn't like how he looks in them otherwise, and also has contacts because of this.
I think that when he was younger, he hated wearing them and he stopped wearing them after being disowned because there was no one to make him.
At some point, when he's developed more of his personal style, he learns that they do make cool glasses, and he gets a pair. That makes wearing them more ideal.
Giorno
He was dropped on his head as a baby so one of his eyes is way worse than the other. The other is fine, so he wouldn't get glasses because he can just fake it till he makes it.
I would be remiss to not mention my Giorno glass eye headcanon- sometimes I do it where he loses his eye and gets a glass eye in the babyface fight (he likes changing it from real eye back to a glass eye to have another party trick to freak people out with), and it would be fun if he lost his good eye. This would make faking good eyesight much harder. The Don of Passione cannot see.
Mista
I have two options for Mista. One is that he hates wearing glasses but the idea of contacts freaks him the fuck out. He does not want to put his fingers in his eyes. He only wears his glasses when he absolutely needs to aim his gun. Maybe he has an avant-garde grandma glasses chain that his equally cool glasses can hang from. He can't read the street signs when he's not wearing them but he totally doesn't need them.
The other option is that he wears both contacts and glasses- your eyes don't know the difference if the prescriptions match up to your actual prescription and his do. Why is he consistently getting new contacts when he could just get his eyes checked again? Why would he? He has a system.
Bucciarati
He doesn't have a particularly strong prescription and wearing his glasses takes away from his mafioso image. The old ladies who are fond of him would think they're cute and that's not really helping his respectability as a mobster, and all that. The glasses would be cool though, probably a cat eye.
Abbacchio
He used to wear contacts but he slept in them too much and got an eye infection. His glasses are either lost or broken. He wears sunglasses with an outdated prescription when he's hungover.
Narancia
If he does need glasses he's not getting it checked, but I think he probably has some of the best vision in the group. Like, if he got his eyes checked he'd probably walk away with a prescription but it's nothing that would really necessitate wearing them. He's not squinting or anything.
I think more of his difficulties with math would be attention-based (I've also seen dyslexia/discalculia which is fun) and wouldn't have anything to do with his eyesight. Fugo would probably wonder about it being glasses and insist they have his eyes checked. Whether or not this actually happens is... debatable. They're both stubborn as fuck.
Trish
I think it would be funny if the glasses she wore in the scene she was introduced were actually her glasses. She just doesn't wear them for one reason or another- if asked she says something about not wanting to see their ugly faces in high definition. Maybe they just don't go with her outfit. Maybe she left them in the bathroom with the pile of disguise clothes and is constantly cursing herself for leaving them there.