Abstract
In this monograph, the author has considered the group of lesions affecting the optic chiasm, discussing the symptoms and means of diagnosing such lesions, their pathogenesis and treatment. The study of the visual fields is discussed fully, as the most important means of diagnosing chiasmal lesions. The author gives credit to Cushing and Walker, Bjerrum, Rönne and Traquair for their advances in this subject, adopting Traquair's description of the visual field and his method of designating fields according to the diameter of the object used over that of the perimetric arc. (Thus the field for 1/330 is that for a 1 mm. object at 330 mm.) He quotes cases of early chiasmal disease in which the fields for a 10 mm. object were normal, while those for 1 mm. showed a characteristic bitemporal defect. The frequent occurrence of scotomas, usually connected with a defect in
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