Capthas are not very visually challenged friendly. When the average sighted internet user who is asked to type a couple of distorted half-erased words often cannot tell between l and I, an o and a 0, just imagine what the bespectacled person has to go through when he is about to send a comment or open an account somewhere. Probably the same frustration and nonsuccess the bots are meant to face.

Although the standard captcha is usually accompanied with a disabled icon, offering the blind or visually impaired an audible version of the text, it hardly facilitates. Maybe because the audio captcha is usually as vague and ambiguous as the text captcha, and perhaps due to the unsuitable environmental conditions for careful listening an audio captcha requires.

Fortunately, there are some captcha alternatives that help the visually impaired regain his belonging to the human society:

-          Image captcha – where the user is asked to recognize a certain image in a group of images.
-          Question captcha – with first grade math quizzes or simple logic questions
-          Verification code – where an activation code is sent to your email address or cellular phone and you should verify it back.

Other captcha alternative may include a bigger and bolder text or alpha numeric combination on a contrasting background.