what does #9 point out about the woman? why would she have lied?

While Fourth Juror is speaking, he rubs his nose where his spectacles have made indentations. This causes 9th Juror to realize that the woman also had those same marks on her nose and must have worn glasses, despite the fact that she didn’t wear them in court, presumably for her own vanity. This causes all of the jurors to question the eyesight of the woman, who may have witnessed the murder without her glasses.