Well, not all pairs are made to correct eyesight; some people may simply like the feeling of having them on. They make one 'look smart', or at least 'feel smart'.

[She fumbles with the box for a moment -- oof, why did it have to be one she couldn't carry with one arm... -- before slowly taking off her pair of glasses. There wasn't much point shying away from him now... though now that she thinks on it some, it feels like she may have let something else slip with her messing about.

...no, it couldn't be the aforementioned box, could it? Well, she's bringing the attention to her glasses, so hopefully it won't be spotted out of the corner of his eye?] Here, why not give them a try?