Hearing aid
An instrument to help in hearing.
There are four common styles of hearing aids.</P> From largest to smallest, they are: > >Behind-the-ear (BTE) hearing aids, >In-the-ear (ITE) hearing aids, >In-the-canal (ITC) hearing aids, and >Completely-in-the-canal (CIC) hearing aids.
</LI></UL> There is also a body hearing aid for very severe hearing loss.
In general, hearing aids should ideally be binaural (in both ears), if the hearing loss involves both ears.