Single-Sided Deafness: Living and Hearing With One Ear in Edmonton

When people think about hearing loss, they usually imagine both ears losing volume equally. But for a significant number of people, the reality is different: normal hearing in one ear and little or no usable hearing in the other.

This is called single-sided deafness, or unilateral hearing loss. It is more disruptive than most people assume, and it is often underestimated by those who have not experienced it.

What single-sided deafness actually means

A person with single-sided deafness can hear normally from one side but receives little or no sound from the other. The hearing ear works fine on its own, which is why many people with this condition are told “you still have one good ear” as if that settles the matter.

It does not.

Human hearing is designed to work in stereo. Two ears working together allow the brain to compare the tiny differences in timing and volume between the signals each ear receives. This comparison is how we determine where sounds are coming from and how we separate a single voice from background noise.

With one ear, both of those abilities are significantly reduced.

The real-world challenges

Sound localization is gone. You cannot tell which direction a sound is coming from. A car horn, someone calling your name, an alarm — you hear it, but you do not know where it is. This is a genuine safety issue, especially in traffic, parking lots, and construction zones.

Background noise overwhelms speech. In quiet settings, one ear is enough to follow a conversation. In a noisy restaurant, a busy office, or a classroom, the brain can no longer filter out background noise the way two ears can. The cocktail party effect, the ability to focus on one voice in a crowd, depends on binaural hearing. Without it, noisy environments become exhausting.

The head shadow effect. Sound coming from the deaf side has to travel around the head to reach the hearing ear. High-frequency sounds, which carry most of the consonant information in speech, are particularly affected. If someone speaks to you from your deaf side, you may hear their voice but not understand their words.

Fatigue. Listening with one ear in a world designed for two requires constant extra effort. By the end of a workday, many people with single-sided deafness are mentally exhausted from the effort of following conversations, attending meetings, and staying aware of their environment.

Common causes

Single-sided deafness can result from:

• Sudden sensorineural hearing loss (idiopathic, viral, or vascular)
• Acoustic neuroma (a benign tumour on the auditory nerve)
• Meniere’s disease affecting one ear
• Trauma or surgery to one ear
• Congenital hearing loss present from birth in one ear
• Chronic ear infections that damaged one ear
• Measles, mumps, or meningitis

Some people have had single-sided deafness their entire lives. Others lose hearing in one ear suddenly, which brings an abrupt and disorienting adjustment.

Treatment options

A conventional hearing aid amplifies sound and sends it to the same ear. For single-sided deafness, that approach does not work when the affected ear has no usable hearing to amplify. Instead, the goal is to get sound from the deaf side to the hearing ear.

CROS hearing aids. CROS stands for Contralateral Routing of Signal. A microphone is worn on the deaf ear, and it wirelessly transmits sound to a receiver on the hearing ear. This does not restore hearing in the deaf ear, but it eliminates the head shadow effect. Sounds from the deaf side reach the hearing ear at full strength.

CROS hearing aids are small, wireless, and cosmetically similar to regular hearing aids. Modern CROS systems are nearly invisible and process sound quickly enough that the delay is imperceptible.

BiCROS hearing aids. If you have hearing loss in both ears but one is significantly worse than the other, a BiCROS system combines a CROS microphone on the worse ear with a full hearing aid on the better ear. The better ear gets amplification for its own hearing loss plus the signal from the worse side.

Bone conduction devices. These devices, such as the Osia or Ponto systems, transmit sound through the skull bone directly to the inner ear of the hearing side. A small processor worn on or implanted near the deaf ear picks up sound and sends vibrations through the bone to the cochlea on the other side.

Bone conduction devices require a minor surgical procedure to place an implant or abutment. They are very effective for single-sided deafness but involve a more significant commitment than CROS hearing aids.

Cochlear implants. For some cases of single-sided deafness, a cochlear implant in the deaf ear can restore functional hearing to that side. This is a newer application of cochlear implant technology, and candidacy depends on the cause and duration of the hearing loss, the health of the auditory nerve, and individual factors.

Cochlear implants for single-sided deafness are available in Canada through referral to specialized centres. Your audiologist can assess whether you might be a candidate and coordinate the referral process.

Strategies for daily life

Beyond devices, practical strategies help manage single-sided deafness:

Position yourself strategically. In restaurants, sit with your hearing ear toward the table and your deaf ear toward the wall. In meetings, choose a seat that puts most speakers on your hearing side.

Tell people. A simple “I am deaf in my left ear, could you speak on my right side?” prevents a lot of missed conversation. Most people are happy to accommodate when they know.

Choose quieter venues. When you have the choice, pick the restaurant without the live band. Background noise is your biggest enemy, and reducing it at the source is more effective than any device.

Use visual cues. Face the person speaking. Watch their mouth and expressions. Visual information supplements what your hearing ear picks up and helps fill in the gaps.

Take breaks. Listening fatigue is real. Give yourself permission to step away from noisy environments when you need to.

Getting help in Edmonton

At Medicine Place Hearing Care, we see patients with single-sided deafness regularly. We can assess your hearing, discuss the device options that match your lifestyle and budget, and set you up with a trial of CROS hearing aids so you can experience the difference before committing.

If you have been managing single-sided deafness without help, or if you have recently lost hearing in one ear, a hearing assessment is the first step toward understanding your options.

Book a hearing assessment at Medicine Place Hearing Care in Edmonton.