Photoshop Cs5 V.12.0. And 2560x1600 Retina Display Problem


Hello Everyone!

I've just downloaded Photoshop CS5 v.12.0. and everything is quite good, except for one thing - the PS is launching in very low resolution. Seriously, on a MacBook Pro Retina display 2560x1600 the PS looks like 1280x800! It feels like my sight is poor, everything is blurry and low-qualiy.

Has anybody experienced that issue with Photoshop? Can I fix it somehow?
(MacOS X 10.9.4; MacBook Pro Retina 13" 2014)