The typical Hollywood perception of girls (or, for that matter, guys) wearing glasses is that they are nerdy, homely, or otherwise undesirable in various ways. These ways could include the "sex appeal" department, and it could also include the strangely instantaneous deletion of glasses from the face of any up-and-coming hero or heroine in stories, movies, or television shows. Depending on your personal preference, this could be part of an Unnecessary Makeover. Always the first step in a Makeover Montage. (Oddly enough, a character that loses his/her specs as part of this trope almost never suffers afterward from the sort of vision problems that presumably required them to be worn in the first place.)