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• Evaluating Existing Audio CAPTCHAs and an Interface Optimized for Non-Visual Use

  Jeffrey P. Bigham, Anna C. Cavender · 2009 · Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI 2009)

  This paper presents the first large-scale evaluation of audio CAPTCHAs — the purportedly accessible alternative to visual CAPTCHAs — revealing that they are dramatically more difficult for both blind and sighted users. The study gathered 10 types of audio CAPTCHAs from major…

  blind and low vision · web accessibility · screen readers · CAPTCHA · authentication

• Trailblazer: Enabling Blind Users to Blaze Trails Through the Web

  Jeffrey P. Bigham, Tessa Lau, Jeffrey Nichols · 2009 · IUI '09: Proceedings of the 14th International Conference on Intelligent User Interfaces

  This paper introduces TrailBlazer, a system designed to help blind web users complete tasks more efficiently by providing step-by-step guidance through web pages. The core problem it addresses is that blind users relying on screen readers must often perform time-consuming linear…

  screen readers · blind users · web accessibility · non-visual interfaces · programming by demonstration

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