Change screen resolution - zoom, blur the fonts, but I found a way to make the fonts bigger, but it is a way - a very strange and only works in the case of mackbook pro retina + thunderbolt display. Connect your laptop to the monitor, turn on the repeat mode screen, then again open the menu ( somehow only) and select the mode best for retina laptop. The monitor shudders and switches to the screen resolution of the laptop - all fonts, including system, double and eyes relax from happiness. the drawback that not the entire screen is used - the aspect of the laptop, but this is mere trifles compared with the pleasure of a large clear font. The Mac mini is not passed. On the Mac Pro too, alas.