Talking about disability - words to use and words not to use

http://www.engvid.com/ Can I use the word retard when talking about someone with a disability or is this an unacceptable term? What is the difference between visually impaired and blind? Should I say someone is handicapped or disabled? This lesson will teach you vocabulary for talking about disability. It will also teach you words that you should avoid. This is not just a vocabulary lesson; you'll also learn about North American culture. Take a quiz on this lesson at http://www.engvid.com/disability-vocabulary/ .