More and more websites that use CAPTCHAs have started to cater for visually-impaired users who cannot solve a visual (text-based) CAPTCHA by providing an audio CAPTCHA.
What I find bizarre is that the UI element used to invoke the audio CAPTCHA is a wheelchair symbol.
Leaving aside for a moment the problem that it doesn’t look clickable, what are the ramifications of using this symbol for a function that is completely unrelated to wheelchairs?
Of course I understand that the thinking behind this is likely that the symbol would be easily understood to refer generally to “disabilities” — but how are visually-impaired users, who can’t see the symbol anyway, going to benefit from that, keeping in mind that the symbol is 10 times smaller than the CAPTCHA? Is it worth the risk of offending/alienating visually healthy users who happen to be bound to a wheelchair?