Cochlear Implant: Who Is a Candidate?

What is a cochlear implant and how does it differ from a hearing aid?

A hearing aid amplifies sound. It is most effective when some functional hair cells remain in the inner ear (cochlea) to translate amplified sound into nerve signals.

A cochlear implant works differently. It consists of an external sound processor worn behind the ear and an internal device surgically placed under the skin. The internal component sends electrical signals directly to the auditory nerve, bypassing the damaged cochlear hair cells entirely. Because the signal goes straight to the nerve, cochlear implants can restore meaningful hearing in people whose hearing loss is too severe for a hearing aid to help adequately.

The AAO-HNS clinical practice guideline for age-related hearing loss emphasizes that when hearing aids provide insufficient benefit, cochlear implant evaluation is the appropriate next step 1Ref 1Tsai Do BS, Bush ML, Weinreich HM, et al. (2024).Clinical Practice Guideline: Age-Related Hearing Loss.Cochlear implant evaluation as the next step when hearing aids are insufficient; hearing loss impact on cognition and quality of life; broadening candidacy criteria.

What is the typical candidacy criterion for adults?

The traditional candidacy threshold for cochlear implants in adults has been bilateral severe-to-profound sensorineural hearing loss (hearing thresholds of 70 dB or greater) with poor speech understanding despite optimally fitted hearing aids 1Ref 1Tsai Do BS, Bush ML, Weinreich HM, et al. (2024).Clinical Practice Guideline: Age-Related Hearing Loss.Cochlear implant evaluation as the next step when hearing aids are insufficient; hearing loss impact on cognition and quality of life; broadening candidacy criteria.

In practice, candidacy evaluations assess 2Ref 2Zwolan TA, Basura G (2021).Determining Cochlear Implant Candidacy in Adults: Limitations, Expansions, and Opportunities for Improvement.Expanded candidacy criteria for adult cochlear implants including off-label use in moderate loss; FDA approval evolution; clinical practice shift to sentence-in-noise testing:

• Audiogram results — how severe the hearing loss is across frequencies
• Word recognition or speech perception in quiet and noise — standardized tests measuring how much a person understands in real-world listening conditions
• Hearing aid trial — confirmation that properly fitted hearing aids do not provide sufficient benefit
• Medical factors — the cochlea must be anatomically suitable for electrode placement; imaging (MRI or CT) is used to evaluate this
• Motivation and support — adaptation to cochlear implant hearing requires active participation in auditory rehabilitation; social support is considered

Candidacy criteria have broadened over time. Current FDA approvals and clinical practice increasingly evaluate adults with more moderate hearing loss who struggle significantly in noise, reflecting evidence that outcomes are better when implantation occurs before hearing loss becomes total 2Ref 2Zwolan TA, Basura G (2021).Determining Cochlear Implant Candidacy in Adults: Limitations, Expansions, and Opportunities for Improvement.Expanded candidacy criteria for adult cochlear implants including off-label use in moderate loss; FDA approval evolution; clinical practice shift to sentence-in-noise testing.

Is cochlear implantation only for those born deaf?

No. The majority of cochlear implant recipients are adults who developed hearing loss over time — most commonly from aging (presbycusis), noise exposure, or progressive sensorineural conditions. Adults who had normal hearing before losing it generally have excellent outcomes with cochlear implants because the auditory processing pathways in the brain remain well developed.

Adults who have had profound hearing loss since birth or early childhood also benefit, though auditory rehabilitation may be more intensive.

What does the evaluation process involve?

A formal cochlear implant evaluation typically involves:

1. Comprehensive audiological evaluation — full audiogram and speech perception testing 2. Hearing aid benefit assessment — testing speech understanding with best-fit hearing aids 3. Otolaryngology (ENT) or neurotology evaluation — to assess the ear anatomy, overall health, and any medical contraindications 4. Imaging — CT of the temporal bones and/or MRI to assess cochlear anatomy 5. Counseling — discussion of realistic expectations, the adaptation process, and ongoing auditory rehabilitation

Cochlear implant programs are available at academic medical centers and specialized hearing centers. A referral to an audiologist or otolaryngologist is the starting point.

What outcomes can adults expect?

Outcomes vary by individual, but most adults with severe-to-profound hearing loss who meet candidacy criteria experience meaningful improvement in speech understanding and quality of life. The AAO-HNS age-related hearing loss guideline notes that hearing loss significantly affects cognitive health, social engagement, and safety, and that treatment — including cochlear implants when appropriate — improves these outcomes 1Ref 1Tsai Do BS, Bush ML, Weinreich HM, et al. (2024).Clinical Practice Guideline: Age-Related Hearing Loss.Cochlear implant evaluation as the next step when hearing aids are insufficient; hearing loss impact on cognition and quality of life; broadening candidacy criteria.

Adaptation takes time. Many recipients do not achieve their best hearing performance until six to twelve months after activation, with improvement continuing for longer with consistent use and rehabilitation.

How can Gale help?

Cochlear implant evaluation and surgery are performed by audiologists and ENT specialists, specifically neurotologists (ENTs with specialized fellowship training in the inner ear). Gale can help you understand whether a referral for cochlear implant evaluation is appropriate, navigate your options, and prepare for appointments with a specialist team.