VoiceOver on OS X 10.8 Mountain Lion
Apple Mac has the built-in screen reading feature called VoiceOver. In fact, Mac OS X is the first OS to include an advanced screen-reading technology as a standard feature. Basically the screen reading describes aloud what appears on your computer screen: text in documents, windows, menus, dialogs, and more. So those who are blind or have low vision can control their computer. Using VoiceOver, they can control the Mac with a keyboard, a braille display, or a Multi-Touch trackpad — instead of a mouse.
There have been a number of changes in OS X 10.8, Mountain Lion. In earlier versions of Mac OS X, Universal Access provided settings aimed at assisting the disabled. With the latest OS X 10.8 or we call it the Mountain Lion, these settings are now available in the Accessibility preferences panel.
How to turn on or off VoiceOver on OS X 10.8 Mountain Lion?
With the new Accessibility panel on , these functions are displayed in a window to the left. There are 7 items: Display, Zoom, VoiceOver, Audio, Keyboard, Mouse & Trackpad, and Speakable Items.
As each item in the left side window is highlighted, so the controls available are shown in the main panel. Under the VoiceOver window, you will find out that the panel has a text description of the purpose of VoiceOver: to provide spoken and brailled (sic) descriptions of what is on the screen and to help control the computer by the keyboard. There is a single checkbox: Enable VoiceOver. This may also be turned on using the Command + F5 keys. Once the screen reading feature is enable, your Mac will read almost everything on your screen. You can disable the screen reading from the Accessibility panel on Mac OS X 10.8 Mountain Lion any time you like.