Hold on to what you have, never let go. Find out what happens in the truth blow below. Oh I think I made a mess, I made a mess. Lyrics taken from http://www.lyricsmode.com/lyrics/c/coheed_and_cambria/random_reality_shifts.html.
The usual definition of a hearing impairment is any lessening of a person's ability to hear. Under the Individuals with Disabilities Education Act (IDEA), hearing impairment has a special meaning. It is a permanent hearing loss or a decrease in hearing that is so significant it negatively affects a child's performance in school or ability to learn.
'Hard of hearing' refers to people with hearing loss ranging from mild to severe. People who are hard of hearing usually communicate through spoken language and can benefit from hearing aids, cochlear implants, and other assistive devices as well as captioning.