Captchas are not accessible for blind users

Hi,

There are no way for blind users to solve captchas on bridge.torproject.org, would it be possible to add a way to make it possible please? A solution could be to provide an audio captcha, using combinations of numbers or in all cases, something spelled. I think Recaptcha gives the possibility to add it, but I used it a long time ago so I am not sure it is still the case.

Trac:
Username: PZajda