The causes and prevention of miners' nystagmus.

Abstract
"Miners' nystagmus is an occupational neurosis which is confined to workers in coal mines. The chief symptom and physical sign is a rotatory oscillation of the eyeballs, which prevents the miner from accurately fixing anything towards which his vision is directed. The result may be compared to a cinematograph exhibition, in which the pictures have not been taken rapidly enough to produce a continuous image, or where the film has been worn away by over-use, giving a blurred image. Description. The man first notices that he is unable to perform the more skilled part of his work; he cannot notch timber well, and fails to drive his wedge, or strike with his pick the exact piece of coal aimed at. He next complains that the lamps dazzle his eyes, that he is unable to see anything at night time, and, finally, that the lamps and all surrounding objects are going round and round. Headache, varying from slight pain between the temples to attacks of extreme severity, giddiness on exertion and stooping, night-blindness, dread of light, and in severe cases marked nervous depression (two of my cases have expressed suicidal intentions), are all found in a marked case of nystagmus."

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