2AM's Jo Kwon revealed on the September 16 edition of SBS 'Magic Eye' the reason behind Changmin's use of glasses despite having nearly perfect vision. 

On this day, the MCs as well as the guests discussed the topic of being nosy, talking about instances where they thought that others were pushing their boundaries when it came to intruding in their lives.

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He said, "When 2AM's Changmin debuted, J.Y. Park told him to wear glasses, so he complied. But Changmin's eyes are 20/20 and he can even read really small letters perfectly." 

Jo Kwon also added, "Afterwards, during the second album, Changmin didn't wear glasses because he didn't want to, and every person who saw him asked why he wasn't wearing glasses. The fact that they didn't know about his nearly perfect eyesight and they were still asking those questions, made me think that they were being nosy."