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A. D., age 24, German-American, a medical student, has been a student and teacher all his life; has not been sick since childhood; had no severe illness during that period. He did not have scarlet fever nor diphtheria, and has never had diseases of the eyes of any kind.
While attending high school at about the age of 15 years, he first discovered that he could produce at will lateral nystagmus, and afterward often amused his classmates by his optical gymnastics. It was never involuntary. He has never experienced any difficulty in starting the eyes going but can continue the movement less than a minute, as the muscles become exhausted. He can not produce it in one eye alone. Nystagmus is most pronounced when fixing the eyes on an object six to eight feet distant, directly in front, but can continue at less rapidity when the eyes are making the
GAMBLE WE. VOLUNTARY LATERAL NYSTAGMUS. REPORT OF A CASE. JAMA. 1899;XXXII(9):483. doi:10.1001/jama.1899.92450360033001q
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