Mac OS X- Hear your way around a Mac

For those who are blind or visually impaired VoiceOver screen reader technology, which is part of OS X Lion lets you use your computer through spoken description and offers plug-and-play support for Braille displays. If you are using a screen reader, but have trouble reading text on a computer screen, you can have your Mac "speak" the text that you select. OS X Lion also allows you to increase the content on the screen, including cursor and adjust the display contrast to white on black or black on white for better visibility.
See your way around the Mac.

For those who have full or partial hearing loss, OS X Lion allows you to change the system notices from the sound signal into a visual warning. Thus, if an application needs your attention, and not play the tone, Leo flashes the entire screen. Leo also supports playback of closed captioning using QuickTime Player, Front Row and applications, DVD-player. And if you communicate with sign language, IChat and high-quality video frame rate of a camera is a great way to stay in touch with anyone, anywhere.
Talk your way around the Mac.

For those who are difficult to use a mouse, keyboard or trackpad, OS X Lion mouse functions keys, slow keys, sticky keys, on-screen keyboard, customizable hot keys, trackpad gestures, and more to help you navigate Mac. Speakable items allows you to control your computer using your voice instead of keyboard. And your Mac can even help you perform common tasks by recording your actions as you have them and save them for later use.