Single-sided deafness (SSD) is a condition in which a person has lost hearing in one ear, but can still hear with the other ear. It’s also known as unilateral hearing loss, which is prevalent is 40% of the population with hearing impaired. We are designed to have two ears for a reason—the brain uses both ears to pinpoint the location of a sound, and to improve hearing quality and range. This is known as binaural hearing.
- Unable to judge the loudness of a sound
- Confusions in pinpointing the location of a sounds
- Poor understanding of speech/ muffled speech due to head-shadow effect
- Difficulty to filter noise to understand speech in noisy listening environments
- These tends to add up stress, anxiety and frustration as well
Single sided deafness can be experienced because of various factors such as-
- Meniere’s disease
- Physical damage to the ear
- Head trauma
- Acoustic neuroma
- Viral or bacterial infection
- Circulatory system disorders
A patient of age 37yrs suffered with unilateral hearing loss after a head trauma due to accident. He was a university professor and had an active lifestyle. He used to attend and give seminars, conduct classes and attend meeting on daily basis. The hearing loss started causing hindrance in his career as he found it extremely difficult to locate and understand when his students and coworkers communicated with him. After diagnosis and analyzing all his needs, he was recommended usage of Contralateral routing of sound system (CROS), this system is uniquely made for people with single sided deafness in one ear and normal hearing in the other. When you wear a device on either side of the ear, the signal from non-functional ear is routed wirelessly to the well-functioning ear. The nonfunctioning ear has a transmitter, which only transmits the signals received from the particular side to the receiver that is placed on the functional ear. With the help of this system, my client did not miss out on any discussions and was completely satisfied with the results. For people who have mild to moderate loss on the functional ear, there is an option called Bi-cros, which works in a similar way, only by providing the necessary amplification through the receiver in the functional ear.
Benefits of using a cros or bi-cros device-
- Clearer and easier conversations with precise speech audibility and accurate speech detection in difficult listening situations
- Better understanding of speech in noise
- Wind, noise, whistling and feedback management for optimal speech accuracy
- Simultaneous processing of multiple sounds for a comfortable listening experience that makes speech crisp and clear while keeping ambient noise natural
- Improved phone conversations with ear-to-ear streaming.
Signia hearing aids provide cros and bi-cros fitting accessories called CROS Pure available in two different technologies, Primax (Px) and Nx respectively.
- CROS/Bi-Cros Px works on primax technology, compatible hearing aids with this transmitter are
- Insio 3Px/5Px/7Px
- Motion 3Px/5Px/7Px
- Pure 3Px/5Px/7Px
2. CROS/Bi-Cros pure 312 Nx works on Signis Nx technology, compatible hearing aids with this transmitter are
- Motion 3Nx/5Nx/7Nx
- Pure 3Nx /5Nx/7Nx
3. Nx technology also provides CROS/Bi-Cros Silk Nx transmitters on Completely in the Canal (CIC) model. Compatible hearing aids with this transmitter are
- Insio 3Nx/5Nx/7Nx
4. CROS Pure Charge & Go Nx transmitter is specially made for rechargeable hearing aids. Compatible hearing aids with this transmitter are
- Motion Charge & Go 3Nx/5Nx/7Nx
- Pure Charge & Go 3Nx /5Nx/7Nx