You know that the big black glasses without lenses are a new born fashion here now. As you say, you see so many girls and boys wear big black glasses without lenses. Yes, this kind of phenomenon is ubiquitous because black is eternal classic style. Therefore, as a girl, I think it is a very good choice. But, you should also know that it all depends on different people, different flavors. Some people might think, black glasses are very cool because of dark color. On the other hand, there are also a lot of people don't like black, so they do not choose this kind of glasses. On the whole, this kind of glasses is very popular. Big black glasses can let girls look fashionable and trend, the same, and also can let a man more handsome and cool.