Can't see much without my glasses. I could if I wanted go around an entire day without them, but I wouldn't be able to read anything or see much of anything. Can't read my screen without them.
I have to make-do without my glasses every once in a while, since I'm a huge fan of cosplaying, and most of the costumes I do don't include glasses, sure I could by lenses, but that's expensive; I usually have to stumble about conventions blind. When you can't see, you squint, right? Most of the time you squint subconsciously to try and read things. Funny story in this is that there is a girl who frequents swedish conventions who to this day thinks I hate her because I squinted at her to see who she was and she thought I was glaring.