To take advantage of advancements in high-resolution display technologies, Illustrator includes native support for high-resolution displays. This feature is currently available for the Mac OS (for example, the MacBook Pro with Retina display). You can work with a sharper and clearer user interface on devices with high-resolution displays. Thumbnails in panels are also much clearer.
Text and complex artwork also display in greater clarity, and in colors and hues that appear more vibrant than before.