Rediscover the wonder of all the sounds that surround you with CROS P

Reconnect and fully engage in conversation, regardless of which side the sound is coming from.

Unilateral hearing loss

Although hearing loss often affects both ears, it is not uncommon that only one side is affected.

Unilateral hearing loss (UHL) describes any degree of permanent hearing loss in one ear with normal hearing in the opposite ear.

The overall prevalence of unilateral hearing loss in American adults is considered to be 7.2%, with 5.2% having a mild, and 1.5% a moderate or worse unilateral hearing loss.2 

Research has shown that unilateral hearing loss is associated with:

  • Difficulties telling which direction sounds are coming from (localization), being less aware of sounds on the side with hearing loss and struggling to understand in noisy environments or at a distance.3,4,5  
  • Feeling less connected and more lonely.6,7,8,9 


How Phonak can help:

Solutions for unilateral hearing loss

Regardless of the level of hearing loss, Phonak offers solutions for UHL, which are easy-to-use and help you to rediscover the wonder of sounds around you.

Aidable hearing loss on one side

If you have a hearing loss on one side that will benefit from a hearing aid, Phonak Audéo™ Paradise delivers proven sound quality and empowering smart apps. More information about Phonak Audéo Paradise.

Unaidable hearing loss on one side

Even when the hearing loss is not suitable for a hearing aid, there are two other great solutions available.

Solutions for Unilateral Hearing Loss - Phonak

Solutions for unaidable unilateral hearing loss

Option A: CROS system

CROS stands for “Contralateral Routing of Signal”. A CROS system consists of two parts

i. the CROS device with a microphone to pick up sounds and voices from the unaidable ear and wirelessly transmit them to the hearing aid

ii. the hearing aid to receive the signal from the unaidable ear and play it to your hearing ear

A CROS hearing aid will transmit sounds and voices to let your hearing ear hear for both your ears. If you have good hearing in one ear and an unaidable hearing loss in the other, then a CROS hearing aid will work for you.

Phonak Hearing Devices for All

Wherever you want

Enables you to have a conversation in quiet and noisy surroundings without having to reposition yourself.

Easy to use

Simply switch it on and enjoy hearing sound and voice coming from both sides.


Option B: Roger Focus

Phonak has the solution for people with UHL whenever it is noisy and their ability to concentrate is impacted.Roger is an easy-to-use system consisiting of a Roger microphone and a receiver. Roger Focus II is the latest ear-level receiver for people with UHL.

Roger Focus Hearing Aids - Phonak
Phonak CROS P – A Paradise Hearing Aid

Phonak CROS P – A Paradise solution for unilateral hearing loss

Phonak CROS P is a microphone built in a small, behind-the-ear housing that picks up sound from the side with hearing loss and sends the sound to the hearing ear wearing a small Phonak Audéo Paradise hearing aid.

You know the situation: You’re in a noisy room and can’t hear your partner or colleagues because they’re not positioned on the side of your good ear, or you’re not aware of the sounds on your poorer ear. If this sounds familiar, Phonak CROS P is the smart solution for you

Find out more

Sudden Hearing Loss in One Ear - Phonak

Roger for unilateral hearing loss

Roger is the optimal solution to improve speech understanding in loud noise and over distance10. Roger microphones stream directly to Paradise hearing aid or Roger Focus II worn on your hearing ear.


Learn more


Find a provider

Let us help you find a provider and schedule an appointment near you. A hearing care provider will provide you with more information about hearing health, have your hearing checked and go over your options.


Stay connected

We strive to have an ongoing relationship with friends and family who struggle with hearing loss. A big part of that relationship is keeping you up-to-date on the latest news and information from the industry.


Online hearing test

Take our Free online hearing test While there's no replacement for a consultation with a hearing-care expert, the Phonak online hearing screening can provide some quick and useful feedback about your hearing.



1Bagatto, M., DesGeorges, J., King, A., Kitterick, P., Laurnagaray, D., Lewis, D., Roush, P., Sladen, D. P., & Tharpe, A. M. (2019). Consensus practice parameter: audiological assessment and management of unilateral hearing loss in children. International Journal of Audiology.
2Golub, J., Lin, F., Lustig, L., & Lalwani, A. (2018). Prevalence of adult unilateral hearing loss and hearing aid use in the United States. The Laryngoscope. 128 (7): 1681-1686.
3Lieu, J. (2010).  Children with unilateral hearing loss. Seminars in Hearing Vol. 31 (4). 
4McKay, S. (2010). Audiological Management of children with single-sided deafness. Seminars in Hearing Vol. 31 (4). 
5Snapp HA, Hoffer ME, Liu X, & Rajguru SM (2017). Effectiveness in Rehabilitation of Current Wireless CROS Technology in Experienced Bone‐Anchored Implant Users. Otol Neurotol. 38 (10): 1397‐1404. 
6Lucas, L., Roulla, K. & Kitterick, P.D. (2017). The psychological and social consequences of single-sided deafness in adulthood. International Journal of Audiology. 1-9. 
7Leterme, G., Bernardeschi D., Bensemman A., Coudert C., Portal J.J., Ferrary E., Sterkers O., Vicaut E., Frachet B., & Bozorg Grayeli A (2015). Contralateral routing of signal hearing aid versus transcutaneous bone conduction in single-sided deafness. Audiol Neurootol. 20(4):251-60.
8Wie, O.B., Pripp A.H., & Tvete O. (2010). Unilateral deafness in adults: effects on communication and social interaction. Ann Otol Rhinol Laryngol. 119: 772–781.
9Pierzycki, R., Edmondson-Jones, M., Dawes, P., Munro, K. J., Moore, D. R., & Kitterick, P. T. (2020). Associations Between Hearing Health and Well-Being in Unilateral Hearing Impairment. Ear and Hearing.
10Thibodeau, L. (2014). Comparison of speech recognition with adaptive digital and FM wireless technology by listeners who use hearing aids. American Journal of Audiology, 23(2), 201-210.


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Knowing you have a hearing loss is only half the battle, speaking with an expert can provide you with the best guidance on what is best for you.  Our online search tool is easy to use and will connect with a Phonak expert in your local area. Don’t wait until it’s too late, connect with an expert today.