Abstract
The extent of occupational impairment of hearing is little realized inasmuch as its beginnings are a slight impairment of hearing for those frequencies of the tone range not used in ordinary speech. The cochlear end organ is a delicate mechanism highly susceptible to chemical poisons and strong auditory stimuli. When exact methods are used in otologic investigation changes in the organ of hearing can be detected even before noxious influences make themselves apparent in other parts of the body. CLASSIFICATION Cases of occupational deafness may be classified grossly as (1) those in which deafness is due to noise or explosive sound, (2) those in which it is caused by poisons and chemical agents, (3) those in which it is due to changes in barometric pressure and (4) those in which it results from trauma. Deafness Due to Noise and Explosive Sounds.—The occupational deafness of this group may be further
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