Impact of Anatomy-Based Cochlear Implant Programming on Early Performance

* At least 18 years of age * Is a cochlear implant candidate as deemed by the participating center * Implanted (or to be implanted) unilaterally with a MED-EL cochlear implant with moderately severe or better acoustic hearing in the contralateral ear. * For patients who are already implanted, device activation must have occurred within 2 weeks of enrollment * Patients with moderate contralateral hearing loss or greater must utilize a hearing aid in the contralateral ear. * Programmed with electric-only stimulation in the implanted ear * The ear to be implanted, acoustic hearing thresholds must be no better than 50 dBHL at 250 Hz and 65 dBHL at 500 Hz * Post-operative CT scan allows for completion of OTOPLAN analysis * ABF settings possible at defaults in clinical programming software * Minimum of 10 active electrodes at activation * Programmed using a Fine Structure coding strategy * English is the primary language * Willing and able to comply with all scheduled procedures as defined in the protocol Exclusion Criteria: * Subjects who do not meet one or more of the above-mentioned inclusion criteria are excluded from the study * Subjects required to use a hearing aid per inclusion criteria who stop use of a hearing aid in the contralateral ear will be withdrawn at the time of discontinued hearing aid use * Subjects who receive a cochlear implant in the contralateral ear prior to the 12-month interval