Glasses can enhance or destroy a person's beauty. It all depends on the type of lens, and the style of frame you choose. Different types of frames/lens suit different types of faces. if you choose the right one, it can look really attractive. Likewise, if you choose the wrong one for your face, then it can turn out to be disastrous.
If the glasses are "subtle" e. g. thin-rimmed then it's OK - am neutral about it then - but I hate thick-rimmed glasses. This is actually one of my "pet hates" - I see so many otherwise beautiful women who ruin their own look by wearing nerdy thick-rimmed glasses. Why? It's like vandalizing your own face.