CROS hearing aid

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A Contralateral Routing Of Signals (CROS)[1] hearing aid is a type of hearing aid that is used to treat unilateral hearing loss. It takes sound from the ear with poorer hearing and transmits to the ear with better hearing.

Most systems are now wireless and are either behind the ear or custom built in-the-ear systems. These wireless systems have replaced earlier wired units which were bulky and rather fussy. Few people found them beneficial, and by contrast the wireless are easier to use and to wear. [2] There are also systems incorporated into eyeglasses. BAHA and transcranial CROS systems use the conductivity of the skull to transmit sound. If hearing loss exists in the better ear then a system in the good ear that combines the function of a regular hearing aid with that of a CROS aid (BiCROS system) is recommended.

See also[edit]


  1. ^ Harford, E., Barry, J. (1965). A rehabilitative approach to the problem of unilateral hearing impairment: Contralateral routing of signals (CROS). J Speech Hear Dis, 30, 121-138.
  2. ^ "CROS hearing aids". hearpeers. Retrieved 12 June 2016. 

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