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KENNETH N. OGLE, Ph.D.

Arch Ophthal. 1939;22(6):1046-1067.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Differences in size between the retinal images of the eyes may arise in asymmetric convergence because the object fixated will be at a different distance from the two eyes.¹ The magnitude of the difference will obviously increase with the nearness of the object and with the degree of the lateral turning of the eyes. In the normal use of the eyes when looking sideways at near objects, retinal images of objects subtending unequal visual angles to the two eyes are fused into a single composite image. No apparent difficulties arise in this act.

Difficulties may arise, however, when it is necessary to fuse images of unequal size produced artificially with size or power lenses or when patterns of unequal size are presented in the stereoscope. Fusion may not then be possible if the difference in size is outside fusional areas (so-called Panum's areas of sensation²). However, apart from . . . [Full Text PDF of this Article]

Author Affiliations
HANOVER, N. H.

From the Department of Research in Physiological Optics, the Dartmouth Eye Institute, Dartmouth Medical School.

Footnotes
In another paper published under the same title (Herzau, W., and Ogle, K. N.: Ueber den Grössenunterschied der Bilder beider Augen bei asymmetrischer Konvergenz und seine Bedeutung für das zweiäugige Sehen. Ein Beitrag zur "Aniseikonia-Forschung," Arch. f. Ophth. 137:327,1937) the problem of the relative sizes of the ocular images when the eyes are turned in asymmetric convergence was considered with special reference to the apparent frontal plane (horopter) as supplemented by experiments on the haploscope. The present paper serves a twofold purpose: first, in presenting the problem from a different point of view with complementary and new experimentation and, second, in acquainting readers to whom the article in German is not available with the essential phenomenon involved.

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