DEAR DOCTOR K: I'm hard of hearing and want to learn more about cochlear implants. Are they a type of hearing aid?
DEAR READER: A cochlear implant involves several small electronic devices that are surgically implanted in the ear. It can provide sound to people who are severely hard of hearing or deaf. It is not a type of hearing aid. In fact, to be eligible for a cochlear implant, a person must have hearing loss in both ears that is so extreme that even the best hearing aid has little or no effect.