Occupational hearing loss may be defined as a hearing impairment in one or both ears, partial or complete, arising in, during the course of, or as the result of one's employment. It can occur suddenly as the result of one's employment. It can occur suddenly as the result of a traumatic injury, intense blasts or explosions, or gradually due to prolonged exposure to excessive noise levels. Hearing losses resulting from blows, blasts, or explosions, as well as from foreign objects and burns, have usually been compensated under schedule of accidental injuries. Industrial noise hearing loss is the accumulative loss of hearing, always of the nerve type, developing over a period of months or years of employment in hazardous noise levels.
Medicolegal Aspects of Industrial Noise, 7 Clev.-Marshall L. Rev. 252 (1958)