Hidden in the Info pane of each OS X Application, lies an Open in Low Resolution checkbox.

Apple it like this:

I’m noticing functional or visual issues with an application. How can I make it work better?
Try opening the application using Low Resolution mode:

1. Quit the application if it is currently open.
2. In the Finder, choose Applications from the Go menu.
3. In the Applications folder that opens, click the application’s icon so it is highlighted.
4. Choose Get Info from the File menu.
5. Place a checkmark next to “Open in Low Resolution” to enable Low Resolution mode.
6. Close the window and double click the Application to reopen it.
7. Note: You may also contact the developer of the application to determine if they are offering an update to the application for the Retina display.

Low Resolution is a way to open an application with its user interface elements not at Retina resolution. It’s likely that the option was needed when the Retina MacBook Pro was first introduced, and not many apps included high-res elements.