Living with good hearing in one ear and little or none in the other is more disruptive than people expect. Single-sided deafness, or SSD, affects an estimated 0.14 percent of US adults, about 350,000 people, and it makes conversation in groups exhausting, hides sound coming from the weaker side, and blurs your sense of where sound is coming from. The encouraging news is that several technologies can help, and the right one depends on your goals.
When the affected ear has too little usable hearing, simply amplifying sound into it does not work; the result is distortion rather than clarity. That is why SSD calls for a different approach: either routing sound to your good ear, or restoring input to the deaf ear directly.
A CROS system (Contralateral Routing of Signal) places a small microphone on your deaf side and wirelessly sends that sound to a receiver worn on your good ear. It does not restore hearing to the deaf ear, but it means you no longer miss the person seated on your weaker side. A BiCROS system does the same and also amplifies the better ear, for people whose good ear has some hearing loss of its own.
CROS is non-surgical, can often be fitted within a visit or two, and is an excellent first step. It helps most when someone is speaking from your deaf side, though it offers less benefit when the noise is on that side instead. Because it is low-risk and reversible, insurers often want a CROS trial before approving surgery.
Bone-anchored hearing systems route sound from the deaf side to the inner ear through bone vibration rather than through the ear canal. They can be previewed non-surgically on a softband before you commit, and the implanted version involves a minor procedure. They are a good fit for certain ear-canal or chronic-infection situations.
Unlike routing devices, a cochlear implant stimulates the hearing nerve in the deaf ear directly, giving the brain true input from that side again. For suitable candidates this can improve understanding in noise, restore a sense of direction, and for many people reduce tinnitus. The US FDA approved cochlear implantation for single-sided deafness in 2019. It is a surgical option and requires an intact hearing nerve, so candidacy is evaluated carefully.
The sensible path for most people is to start with a thorough evaluation and, where appropriate, a CROS or BiCROS trial, because it is quick, non-surgical, and tells you a great deal about how much routing alone helps. If routing is not enough and you want true two-ear hearing, a bone-anchored device or cochlear implant evaluation is the next step.
At Pinnacle Audiology we evaluate single-sided deafness thoroughly, fit and fine-tune CROS and BiCROS systems, and coordinate with implant centers when a surgical option is the better path. If one ear has checked out, we can help you map the options that fit your life.
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