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Article
March 1938

SOME NEWER DEVELOPMENTS IN PRECISION TYPE STEREOSCOPES

Arch Ophthalmol. 1938;19(3):394-402. doi:10.1001/archopht.1938.00850150078006
Abstract

Before describing some of the mechanical details of two new instruments to be presented here, it may be well to discuss briefly the reasons which prompted me to venture into creating and designing such devices as well as the principles favoring their uses.

The tendency of subjecting persons with supposed or actual muscle anomalies to orthoptic training solely on the basis of routine ocular study did not appear satisfactory, because one could not accurately or conveniently adjust the stereoscope to correspond to one's clinical findings. It seemed logical that an instrument designed to correct a binocular disturbance should also provide a definite means for gaging progress or improvement, which, in addition, might be used to determine both qualitatively and quantitatively the status of the eyes, so that the examiner could accurately decide whether the patient really required orthoptic training or just impressive ocular calisthenics. Hence, an optical instrument

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