That's one of the hot questions today, and it will be good that we keep discussing the question because it helps us to spread the facts across the world.
Though the word "Hearing Impaired" was used mostly in the past but not anymore, its old fashion words and it's not acceptable again by most Deaf communities, and it's normal because as the years go by, we change and adapt to something new, something different and something that sounds good. Just as in the past, they use the word "Idiot" to describe a person who has a lack of skills necessary for day to day living and later on it changed to "mentally retarded," and today it's newly called "intellectual disabled."
