The quote expresses the narrator's fear of being perceived differently by someone important to her. It reflects her anxiety about her self-image and how it might change in the eyes of another person, specifically Harold. She worries that a simple physical change, like new glasses, could alter his perception of her, revealing her insecurities and vulnerability.
This concern speaks to a deeper theme in "The Joy Luck Club," emphasizing the complexities of identity and how external appearances can impact relationships. The narrator's thoughts illustrate the struggle many people face with self-acceptance and the fear of not meeting others' expectations, ultimately highlighting the fragility of personal connections.