The Mac operating system includes several assistive technologies designed to make it easier for a person with a disability to use the computer. Whether you have difficulty with your vision, hearing or mobility, the features found under Universal Access in the System Preferences can help you set up your computer to meet your needs.
The Text to Speech feature is useful for users who have low vision but do not use a screenreader.
The Caption Panel of VoiceOver lets a sighted person follow what a person who has a visual impairment is doing while he or she works with VoiceOver.
To improve the contrast and make it easier to read the contents of the screen, use the Display settings in the Seeing pane of the Universal Access window.
The zoom feature built into Mac OS X can magnify the contents of the screen for low vision users.