让残障人士可以使用CAPTCHA。你用过什么方法？

I'm nearing the completion of migrating our existing website to a CMS and I've just finished creating all the various contact forms. The CMS I'm using has CAPTCHA built into it's form builder, which is great, but the only method available is the "decipher-the-noisy-image" method.I'm nearing the completion of migrating our exi