To improve the Chromebook experience for users with visual impairments, Google announced a new version of its ChromeVox tool this week. First, the screen reading feature is now the default option on all Chromebooks running Chrome OS 56 and newer. All you have to do to turn it on is hit Ctrl Alt Z. As part of this update, Google says it made the ChromeVox keyboard controls easier to use. These commands are what help you navigate websites and other apps without a mouse.