It totally depends on the facial structure of the girls face and the glasses she's wearing. As others have said, this can make her hot as hell or the ugly duckling. It's just like any makeup, jewelry, clothes, etc... there's the potential for both extremes of attractiveness. Show us a picture of you with and without your glasses. Then you'll know for sure... for YOU. More importantly... do you need glasses? If you need them, then it's more about finding the ones that do looks sexy on your face. It's stupid to not be able to see for the sake of looks... when you can look good with the glasses you need anyhow. On the other hand, I've heard of girls wearing glasses when they don't need them... because they think they look better. That's just as silly. It's all relative to YOU, your face, and your choice of glasses. Let's see what you got. Either way... you need to rock what you've got!
Facial structure has lots to do with it as well as the type of glasses you wear. Those basic thin frame oval looking glasses don’t normally enhance the look of a girl but instead hide the face. My friend wears glasses when she needs to read, and her lips, nose, eyes and overall facial structure fits perfectly with those big lensed thick framed glasses. She looks geeky but in a cute sexy way.
Take a look at your facial features. Big glowing eyes and full lips paired up with a nice glasses looks great. If you have more softer features like a round face, no real definition, then most glasses will simply make you look awkward. Wear contacts if that’s the case. Most round oval faces (baby faced) look cuter with nice hair and no glasses. If you have those small squinty eyes then yeah put some eyeliner or glasses lol. No worries, just work with what you got.
Look at some pictures online and compare what your facial structure to those girls who look good. Whether if its glasses or no glasses. That should give you a better perspective on what looks attractive.