[quote=@Spriggs27]
<Snipped quote by KoL>

Or you guys were the kids who put lasers in your eyes when your parents said don't do it, or they could have a stigmatism. 
[/quote]

I don't think Chou is that dumb, really. Maybe her sister, but not she. Very much probably it's because she's always with her face buried in a book or a tablet. It's inevitable, since the human eye wasn't made to handle the stress of reading for too long.