Certain physical defects can be corrected only by artificial means. If one is deprived of the use of a limb by amputation, an artificial leg is fitted; if one's eyes become functionally inadequate, one is treated with an artificial aid which will restore as far as possible the ideal 20/20 vision. Without our going into too great detail, impairment in the function of the more highly specialized senses has sometimes an obvious cause and can be corrected. Unfortunately, this situation is not the usual one. Impairment in function of the special senses is in the vast majority of cases a complicated, and often an irreversible, phenomenon. In cases of this type the effect of treatment of any kind is problematic. Either medical and surgical therapy is basically unavailing or success is possible only through the expenditure of an unreasonable amount of time and money and at unjustifiable hazard. If the
HUGHSON W, THOMPSON E. THE HEARING AID FROM THE PATIENT'S POINT OF VIEW. Arch Otolaryngol. 1943;38(3):252–260. doi:10.1001/archotol.1943.00670040265008
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