Yes, Essentially CAPTCHA can prevent spam from robots, but sometimes it sucks the user himself, especially for the blind this is a pity. CAPTCHA is hard to read.
On the other hand the CAPTCHA works correctly preventing bots, for that there are quite a lot of services that provide automatic CAPTCHAs such as bypassing CAPTCHAs.
I hope this can solve the constant CAPTCHA problem in the web browser, and hope for ways to bypass it by completing it automatically and well, thanks @themmos for this.