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An occupational disease that occurs among coal miners, usually those of
middle age or elderly, who have worked for a period of 25 to 30 years
underground. Its physical symptoms consist of difficulty of seeing in the
dark or in poor light, excessive sensitivity to and intolerance of glare,
and a rhythmic oscillation of the eyeballs. As a result of these
oscillations, there may be apparent movement of the objects looked at and
defective visual acuity. Associated with these ocular symptoms are other
general disorders, such as headaches and dizziness, particularly after
stooping or bending, and the development of psychoneurotic symptoms is
common in the later stages of the disease. If the disease is not checked,
the nervous disorders may become so severe as to render the miner totally
disabled. Roberts, 2
Source:
Dictionary of Mining, Mineral, and Related Terms
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