CAPTCHAs Shut Out Blind Users
If anyone still has doubts about the problems that visual CAPTCHAs can create, I suggest that they check out a video produced by the American Federation for the Blind (AFB).
Entitled “CAPTCHAs on Social Networking Sites Shut Out Blind Users“, the video presents a very compelling case against purely visual challenges. However, as the video has been published via YouTube, you will need access to the Flash Player plugin in order to watch it.