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Accessibility implications of Captchas

for

From: Ian Lloyd (Accessify.com)
Date: Feb 17, 2003 3:41AM

OK, first of all, this is what I mean by captchas:

Captchas are "automated Turing tests" that aim to
separate automated scripts from real people. Gimpy is
a popular one, used by Yahoo! for their registration
process. Here are a few useful links:

http://www.captcha.net/captchas/gimpy/
http://www.theregister.co.uk/content/6/28694.html

And here's the first real example I found from Google
(I have no idea what Graal is, by the way)

http://www.graalonline.com/accounts/signup.php

The question I have is how could these systems affect
accessibility?

Obviously, if you cannot see the image, then you are
absolutely stuck. No two ways about this. However,
there are no doubt other issues for people with poor
vision or dyslexia.

If anyone has any ideas about this, any research to
hand etc, please let me know.

Kind regards



====Ian Lloyd
Accessify, vb, "to make accessible"
http://www.accessify.com/

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