FOLLOWING early reports by Harford and Barry1 and Harford and Dodds2 which described CROS (contralateral routing of signal) hearing aids, audiologists have sought to apply the CROS principle and to explore its effectiveness in hearing aid selection. Although initially designed to ameliorate the hearing problems of unilaterally deaf patients, CROS hearing aids have been found beneficial with other types of hearing problems as well (Green et al3 and Dodds and Harford4). The latter authors have recently emphasized that the "open" earmold (their term for a non-occluding earmold) commonly used with a CROS hearing aid gave greater improvement in speech discrimination than either a regular or a special vented earmold as determined with persons having high frequency hearing loss.
The effect of an earmold coupler on the amplification characteristics of hearing aids has been studied by a number of investigators. Briskey et al5 and Lybarger,6
Green DS. Non-Occluding Earmolds With CROS and IROS Hearing Aids. Arch Otolaryngol. 1969;89(3):512–522. doi:10.1001/archotol.1969.00770020514013
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