http://www.tvinsider.com/article/52981/why-does-supergirl-kara-danvers-really-wear-glasses/

Turns out she really does need to wear eyeglasses -- not just to protect her identity.

http://i.imgur.com/emhMGjh.jpg (http://lunapic.com)

I guess that makes sense but either way Melissa looks so darn cute with glasses.