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It seems to be really good at preventing visually impaired users from using your site. Unless it is true that they really do develop better hearing.

I don't know how you would solve that problem, other than not having one at all, which of course wouldn't be fair. Having the audio clearly describe the solution would make the captcha useless.

Yes, I'd really like to hear their perspective on this. I listened to a screen reader once and found it very difficult to understand as well.

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