Some guys look really good with glasses, and some don't. Overall, I don't think it really affects what a guy looks like. I mean, the guys who don't look really good don't necessarily look bad with them on. If you're attractive, you'll be so with or without the glasses.
In my opinion boys don't really change when they wear glasses but they do look kinda cute and more you know mature I've dated some with and without and guess what they're the same type, caring you know
I wear glasses myself for reading and other activities so I don't mind a guy with glasses
It's not a huge deal to me. If he doesn't have any, great. If he does, and they suit his features, great. I find that glasses tend to look best on Asian guys (but... I think Asian guys are just more attractive in general so that may be my personal bias, haha)
I wear glasses... on occasion. I'm not that blind. However, they're a double edged sword. Without glasses, I look like I have an "eat shit" type of angry face, and the glasses make me look less intimidating. With glasses, I look as much of a nerd as I really am, but it highlights how much of a virgin I am, too.