Final answer:
In the book 'Wonder', Justin secretly wore glasses, thinking his parents did not notice.
Step-by-step explanation:
In the book Wonder, Justin did not think his parents noticed that he had started to secretly wear glasses. The narrative doesn't explicitly mention Justin's parents being aware of his new accessory, which suggests that Justin may have thought his decision to wear glasses went unnoticed by them. This is an example of a minor subplot that highlights the character's sense of privacy and independence.