W3C warns that using CAPTCHA on the Web is actually bad idea as it poses problems for those who are blind, have low vision or have a learning disability such as dyslexia. That makes sense.
2005-11-23: The WAI Protocols and Formats Working Group has released Inaccessibility of CAPTCHA: Alternatives to Visual Turing Tests on the Web as a Working Group Note. Requests for visual verification of a bitmapped image pose problems for those who are blind, have low vision or have a learning disability such as dyslexia. The note examines ways for systems to test for human users while preserving access for users with disabilities. Read about the Web Accessibility Initiative.
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