There is one thing, however, that can stop a blind person in his or her tracks more abruptly than just about anything else when it comes to working on the Web, and that is the presence of a graphical image that must be identified before one can proceed any further with a task. The use of these images is known as “Completely Automated Public Turing test to tell Computers and Humans Apart,” or CAPTCHA. According to a recent Mental Floss article, CAPTCHA was “developed in the early 2000s by engineers at Carnegie Mellon University” who wanted to find a way to “filter out the overwhelming armies of spambots pretending to be people.”
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