I would take this article with a huge grain of salt. Amazon doesn't give two shits about blind or deaf or gay programmers. This is a nice fluff piece. The programmers there are under absolute stress and high-stakes programming. I doubt that this one story about one nice programmer can be generalized to Amazon. I would bet if you are a blind programmer you would have a much harder time even getting past the interview loop given how biased the whole company is with their Ayn Rand-ish tactics that would obviously not give two shits about diversity or disability.