In addition to the CLASSIC-CROS hearing aid, originally intended only for persons with unilateral hearing loss, there are now ten versions: MINI-CROS, HI-CROS, FOCAL-CROS, POWER-CROS, BICROS, OPEN-BICROS, UNI-CROS, MULTI-CROS, IROS, and FROS. As a consequence, a greater variety of hearing impairment can be accommodated with wearable amplification. Thus, today more hearing-impaired persons are able to use a hearing aid who otherwise might not, and still others are achieving greater satisfaction from wearable amplification. Most noticeable are persons with asymmetrical hearing loss and those with bilateral high-frequency hearing impairment. We suggest certain guidelines for selecting an appropriate form of amplification on the basis of audiometric configuration and the difference in hearing between the two ears.
Harford E, Dodds E. Versions of the CROS Hearing Aid. Arch Otolaryngol. 1974;100(1):50–57. doi:10.1001/archotol.1974.00780040054011
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