OS X Yosemite: Use accessibility features
Accessibility comes standard in a Mac. Whether you have difficulties with vision, hearing, or physical mobility, OS X includes a variety of features to help you work in alternative ways—and make your Mac even easier to use.
Use the built-in screen reader called VoiceOver
OS X includes VoiceOver, a built-in screen reader that describes aloud what appears on your screen and speaks the text in documents, webpages, and windows. Using VoiceOver, you control your Mac with the keyboard or trackpad gestures. You can connect a refreshable braille display to use with VoiceOver.
To turn on VoiceOver, press Command-F5.
To customize VoiceOver using VoiceOver Utility, press Control-Option-F8 (when VoiceOver is on).
To learn how to use VoiceOver, choose Apple menu > System Preferences, click Accessibility, click VoiceOver, then click Open VoiceOver Training.
For help with VoiceOver, choose Help > VoiceOver Help while VoiceOver Utility is open.
Zoom content on the screen
If items on the screen are too small, you can zoom in to make content larger and easier to see.
To set zoom options, choose Apple menu > System Preferences, click Accessibility, then click Zoom.
Use your keyboard in different ways
If you have trouble using the keyboard, you can turn on Sticky Keys and Slow Keys, to make it easier to press keys.
To set these options, choose Apple menu > System Preferences, click Accessibility, then click Keyboard.
Move the pointer with the keyboard
If you have trouble using a mouse, you can turn on Mouse Keys, then use the keyboard or numeric keypad to move the mouse pointer and press the mouse button.
To set the option, choose Apple menu > System Preferences, click Accessibility, then click Mouse & Trackpad.
Use spoken commands and text to speech
When Enhanced Dictation is enabled, use spoken commands to open apps, choose menu items, and more. OS X provides a large number of commands, and you can create your own spoken commands.
With text-to-speech options, your Mac can speak the text in dialogs and alert messages, and notify you when an app needs you to do something, such as accept a Messages invitation.
Change how your keyboard, mouse, and trackpad work
OS X provides various ways to customize how your keyboard, mouse, and trackpad work. For example, you can adjust the speed at which the pointer moves across the screen when you move your finger across the trackpad.
To set options for your keyboard, choose Apple menu > System Preferences, then click Keyboard.
To set options for your mouse, choose Apple menu > System Preferences, then click Mouse.
To set options for your trackpad, including gestures, choose Apple menu > System Preferences, then click Trackpad.
Control your Mac with adaptive switches
With Switch Control, you can use one or more adaptive accessories to enter text, interact with items on the screen, and control a Mac. Switch Control scans a panel or user interface until a switch is used to select an item or perform an action.
To easily check which accessibility features are on, select the option at the bottom of Accessibility preferences to show the accessibility status in the menu bar.
To quickly turn on common accessibility features without opening System Preferences, press Option-Command-F5. To hear the names of the options spoken in turn, press Tab. To set more accessibility options, click Preferences.
In some apps, you can have your Mac speak text by using the Edit > Speech commands. This functionality might not be available for all languages.