Abstract The fields of vision are tested clinically by using a chosen working distance and by varying the size of the test object. This method is convenient and by custom has become part of the practice of ophthalmology. However, this scheme of testing, and the mathematical analysis which obviously results, leads to a fallacious understanding of the limits of visual space. The error arises from the fact that in daily experience observers are not considering 0bjects which vary in size, but are concerned with objects which remain constant in size and vary in distance. A baseball does not grow or shrink in size; it comes nearer or goes away. The size of the visual field for a given object varies with the apparent size of the object, which is a function of the distance of the object from the observer. The mushroom-shaped island of vision so often reproduced from the References 1. Roenne, H.: Zur Theorie und Technik der Bjerrumschen Gesichtsfelduntersuchung , Arch. Augenh. 78:284, 1915. 2. Glees, M., and Fröhlich, G.: Über die Bedeutung des Aubert-Försterchen Phänomens für die Gesichtsfeldprüfung , von Graefes Arch. Ohpth. 151:195, 1950.Crossref 3. Lamar, E. S.; Hecht, S.; Shlaer, S., and Hendley, C. D.: Size, Shape and Contrast in Detection of Targets by Daylight Vision: I. Data and Analytical Description , J. Optic. Soc. America 37: 531, 1947.Crossref
A.M.A. Archives of Ophthalmology – American Medical Association
Published: May 1, 1955
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