Obviously depends on just how bad your eyes are.

Tldr: I can see perfectly fine without glasses because I have one really good eye and one really bad eye.

I wear prescription lenses. Despite that, I can see pretty clearly without my glasses. I have a scratch on my left cornea that happened when I was 4 years old. My right eye can see better than normal because I guess it was still a developmental stage of my life? I don't know. But I can read literally every line the doctor throws at me with my right eye, and I can do it quickly. But I get stuck on the second or third line down with my left. I'm practically blind in that eye.

What happens is I look at everything through my right eye. I also have a really hard time seeing depth. Seriously, the real world looks no different than a TV screen to me. It's hard to know exactly where something is in 3D space. I've adapted mitigations for it. Like, when I'm driving, I pick points on the car I can see, and if I can't see past it, I assume my wheels are on it. I also stay way the fuck back from other cars. You see that depth perception kill me when I try to put keys in lock cylinders. I will scratch the absolute shit out of a lock. It's like I'm drunk.

But as for seeing? I can see mostly fine without my glasses. I can read things. Distant things. I can make out detail just fine. I can navigate the world perfectly. My powers of perception are pretty close to zero. Glasses don't stop me from stubbing my toes. Really, they're only there to keep my left eye from straining. And to be in compliance with the restrictions on drivers license.

My wife's sister had LASIK a few years ago. Prior to that, she was - for all intents and purposes - blind without them. Like Velma Dinkley, she could not move without them. She could make out fuzzy shapes, but she could not accurately grab an object in front of her. For her, it really was like seeing in 144p. The surgery was seriously life-changing for her.