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.
Types of Hearing Impairment. The external ear and the middle ear conduct sound: the inner ear receives it. If there is some difficulty in the external or middle ear, a conductive hearing loss occurs. If the trouble lies in the inner ear, a sensorineural (SNHL) or nerve hearing loss is the result. When there is some difficulty in both the middle and inner ear, a combination of conductive and sensorineural impairment exists.