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I am indebted to my colleague, Dr. Guy H. Black, Madison, Kan., for the facts in this case. This phenomenon is very rare and seems to be generally unknown, as it is not mentioned in the text-books on ophthalmology to which I have had access. In Landois' physiology it is stated that Bechterew had observed a case of unilateral voluntary control of the iris.
The present example is one of bilateral voluntary iris which occurred in a married woman. It was first observed at the age of 9 years. Attention was drawn to the phenomenon at that time by the ability which the child then developed, of rotating the eyeballs in different directions independently of each other. From that time on it was a matter of fact established by almost daily demonstration, and observed by the various members of the family and their friends, that the iris of either eye
SHERER JW. A CASE OF VOLUNTARY IRIS.. JAMA. 1905;XLIV(18):1449. doi:10.1001/jama.1905.92500450036003b
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