CAPTCHA Codes are not Accessible
CAPTCHA tests are showing up like crazy these days to validate that users are humans, and not computers. They are used in blog comments, and are getting popular for online registration sites.
I think that most people implementing captcha's these days are overlooking the fact that they are not accessible, and they would fail Section 508 accessibility compliance for a web application.
Nearly 10% of the population is color blind, and even more can't see very well. Some CAPTCHA codes are hard for me to read and I am not color blind, and have 20/20 vision. Just take a look at the CAPTCHA code on slashdot to see what I mean.
By the way CAPTCHA is an acronym for "completely automated public turing test to tell computers and humans apart."
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- Accessibility and Usability in Forms Outline - February 14, 2006
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