I was trying to wait a movie in HBO but one that showing is the documentary which a woman is deaf when she was born and she got married and has kids. It is amazes me that, because of hearing aid people can hear sounds. My husbands grandma is 92 year-old she still have good eyesight but she is frail and her hearing is bad now and that is why she got a hearing aid recently. For a long time, we do not have a hearing aid or an apparatus for people who cannot hear clearly. To find out more about hearing aid, you can check in wikipedia.