Basics
Why is one ear sometimes implanted before the other?
Funding, surgical caution and case-by-case clinical reasons can mean unilateral implantation first, with the other ear implanted later if outcomes are good.
Unilateral CI gives substantial benefit. Bilateral CI gives additional benefits in localisation and noise. In countries where funding for both ears in one surgery is limited, sequential (one-at-a-time) implantation is common.
Long gaps between first and second ear implantation are not ideal — the unstimulated auditory pathway can become less responsive over time. If sequential bilateral is planned, the second ear should follow within a few years where possible.
Medical disclaimer: This information is for awareness and education only. It does not replace consultation with a qualified ENT surgeon, audiologist or medical professional. Cochlear implant eligibility must be determined after clinical evaluation and diagnostic testing.
Reviewed by HearClear Clinical Editorial Team · Last reviewed: 2026-06-15