Profound hearing loss makes it difficult for a person to fully integrate into society. Cochlear implantation is rightfully considered a universal and an effective method of rehabilitation of patients with severe and profound hearing loss. The advantages of binaural hearing are well known; the advantages of bilateral cochlear implantation over monolateral implantation are undeniable, due to the restoration of all binaural hearing effects. At the moment, the relevance of simultaneous cochlear implantation, especially among children, and its benefits compared with sequential implantation are being discussed. It is known that there are special groups of patients among patients with hearing loss; they are either unrehabilitated at all or rehabilitation measures for which are ineffective. Special patient groups include patients with unilateral acquired or congenital deafness, asymmetric and residual hearing loss. Patients in these groups often complain of poor speech intelligibility, especially against a background of noise, inability to localize the source of sound, one-sided or two-sided tinnitus, and, as a result, a deterioration in the quality of life. All abovementioned makes us think about the need to revise the indications for cochlear implantation and study this issue in detail.