J Neurol Surg B 2019; 80(02): 132-138
DOI: 10.1055/s-0039-1677687
Invited Review
Georg Thieme Verlag KG Stuttgart · New York

Nonsurgical Management of Single-Sided Deafness: Contralateral Routing of Signal

Hillary Snapp
1  Department of Otolaryngology, University of Miami, Miami, Florida, United States
› Author Affiliations
Further Information

Publication History

01 June 2018

26 November 2018

Publication Date:
17 January 2019 (eFirst)


In recent years, an increasing research effort has been directed toward remediation of single-sided deafness. Contralateral routing of signal (CROS) is the longest standing rehabilitation solution for individuals with single-sided deafness. The primary goal of CROS technology is to transfer the signal received at the deaf ear to the better hearing ear, thereby reducing the impact of the acoustic head-shadow. This allows for individuals with single-sided deafness to regain access to sounds located at the deaf ear. The hearing deficits associated with single-sided deafness are often debilitating. While surgical management of single-sided deafness is on the rise, CROS hearing aids offer a nonsurgical option to compensate for some of the deficits that occur when a listener is limited to a single ear. Limitations of early CROS devices resulted in poor adoption and acceptance in those with single-sided deafness. Following significant advances in both design and technology, the acceptance of CROS devices has increased in recent years. This paper reviews relevant literature in CROS application for the management of single-sided deafness. Technological advances, benefits, limitations, and clinical considerations are also reviewed in this article.