Since version 1. 3. 1 SonoKey allows you to change the color theme. The Classic theme is lighter with a light blue background and light grey button colors. The new Gaze friendly theme is optimized for eyecontrol users with a dark blue background and dark/light blue button colors. Darker colors are known to be easier accessible for eyetracking users as they reduce light reflections. Darker colors can also be perceived by some to be less tiresome for the eyes.
To change your color scheme, open SonoKey, click on Settings - Color Theme and chose the one you prefer. Please note that you need to update SonoKey if you don't Use version 1. 3. 1 or later.