Two ears are better than one, since binaural, or two-ear hearing, is what helps us determine where sounds are coming from, and to distinguish between competing sounds more easily. If you have a hearing loss in only one ear, you may be fine with one hearing instrument. Age- and noise-related hearing loss tend to affect both ears, but your hearing profile for each ear is probably different. If there is a loss in both ears, then you will benefit more with a binaural approach. In addition, some of the benefits of digital technology require two hearing instruments.