The context of the following conversation is Austin was sent home with a note from his teacher stating he could not see the board, so he got glasses.:
Austin says Guess what I found out the other day?.
The friend responds What was that?.
Austin responds That I need glasses,  The teacher noticed that I couldn't see the board and sent a note home with me..
The friend responds What did the note say?.
Austin responds That I'm a great student--no, of course it told my parents that I needed glasses.
The friend responds I guess that explains why your wearing glasses..